As an owner of an X-T3 and this X-T30, I can safely say the X-T30 is like a leaner, lighter version of it's big brother, with vary few compromises. There are fewer buttons on the back, a slower high speed shutter, and no 400mbps 10bit internal movie recording. But unless you're a professional film maker you will not miss anything. And even if you are, the X-T30 can still HDMI output 10bit 4:2:2 to an external recorder like the X-T3.
Photo wise, it produces the exact same results as the X-T3 as they both share the same sensor.
The only real downside if you're an all-weather photographer is no weather sealing.
All-in-all, it's a beautiful compact Fuji for people who want a lighter camera than the X-T3 at a lower price with few compromises.

It's a good camera at heart. The lenses are lovely, the pictures are sharp and it feels lovely. It has some horrible flaws.

The obvious one is the battery life. I am only getting half the promised 380 frames per charge with no help or acknowledgement from Fujifilm that there might be a problem (although Amazon were very helpful). It's already an expensive camera that doesn't provide a battery charger: am I meant to add a handful of extra batteries as well to the hidden costs?

It's very fiddly to use as well: the opposite of intuitive. In general, wheels need to move in the opposite direction to what I expect. Settings seem to change for no deliberate reason. There is nothing as simple as a single setting for shutter and aperture priority. ISO numbers change randomly. I don't think I have needed to read a camera manual in depth for about 15 years. Until now.

Wow if you are thinking of upgrading to a mirrorless camera then you cant get much better than this little beauty, I love photography and I have completed 3 courses on it but I don't know it all and you never will, this camera will help you grow in confidence about photography, I have a lumix lx100 which is an amazing little camera, perfect for traveling a go anywhere camera, I wanted to up grade and the Fuji xt30 was a perfect match for what I wanted, the things that I loved on the LX100 were the manual controls on it, I felt more connected to the camera, it is a more personal interaction with what I'm doing, the Fuji is very similar in that respect, there is a fine line between style over substance and I am glad to say that this as both, its important to any photographer that the camera can be used for the style you are into but most of all it has to feel right in the hand and this does, you can read all about the technical stuff on the internet till the cows come home but its not until you hold one that you know its right, before you buy any camera go and hold it and see how it feels

I've doing travel photography for 20+ years. I started with Canon (A1) in 1980s and ended with 5DMKIII (2016). Then I dropped Canon, not for quality, but purely for the size and weight. As we get old, weak and tired, we look for lighter & smaller equipment for mobility to keep our (photography) passion alive. So when I found Fuji XT1, I found my solution and sold all my Canon stuff. Then I moved to XT2 and noticed that the camera was getting heavier & bigger slightly. I got XT30 recently ( I don't really need it) purely for the smaller size & weights. I tested it and kept in my travel bag since then. To be honest, now I've a choice: what do I carry for international travels...XT2, XT30 with several lenses or my another recent favourite, the magnificent Sony RX10M4 (24-600 /2.8-4).

Got this after owning the X-T3 as a smaller alternative for travel, which it is, although only around 300g lighter. Its too small really my nose moves the AF point around on the screen when I look through the viewfinder! I use the excellent stabilised 18-55mm kit lens on it, but even this tiny lens seems large on it. I mean the camera is a miracle in terms of what it can do for the size and Im sure I will get on with it as a travel camera, but if you want to do it as a serious hobby with any larger lenses the X-T3 is much more sensible. That said, I think the X series is coming near the end of the line, with Full Frame cameras like the Nikon Z6 being so small/lighter and getting cheaper I cant see me buying another non full frame camera.

Does it all. Small, light, brilliant,accurate colour under all conditions I have tried - the best carry-along camera to a full size, weighty DSLR. Love it !

I bought this camera as a lighter alternative to my XT3. From that aspects, the XT30 is the best. The diminutive size coupled with lenses such as 27/2.8 or 35/2 make a very small and lightweight package for travelling. There is no other interchangeable camera of this quality and size at the moment.
The picture quality is well-known as is the same as XT3. Beautiful rendering and sharp jpegs, my personal favourite is astia with highlight and noise reduction turned down and sharpness boosted a bit.
The focus speed is really improved and the best ever Fuji has managed and is very competitive to the DSLR likes of Nikon and Canon, i.e. nothing to complain about, rather praise-worthy.
I won't complain about the not so great grip compared with XT3 as XT30 is meant to be a smaller model.

Now the not so great bit. The Q button is now placed right next to the thumb grip. I kept pressing that accidently all the time bringing up the shortcut menu on the screen. Also the lack of ok button means you have to press the joystick when selecting pictures etc. It does not always select correctly.
Lastly, Fuji has skipped the separate battery charger with XT30. The good thing is you can use USB-C charging but for those who want to carry an extra battery (As the battery life is not great), buying external charger will be more convenient.
Unfortunately for me, with the annoyances of the Q button and lack of battery charger I would rather continue using the slightly heavier XT3.
Those who are deciding between XT3 and XT30, XT30 still remains a solid choice due to the similar image quality, much lower price and portability. Hopefully, Fuji will issue a fix to disable the Q button in the future and you can always buy a battery charger if needed.