In my mind and experience dry burning is a very good way to clean the coil, as long as you use lowish voltages, and make sure you don't let the coil get too bright. 1s pulses with 3.7V seems to on the safe side with a 1.8 ohm coil.
I got my T3's today. Taking them apart immediately (that's how I am) revealed that the wick is very easy to change, even easier than on the Vivi Nova. Don't know about recoiling though. The coils in the two that I opened were not very consistently made, and I wouldn't be surprised if some came too crooked and the coil would short. I straightened them with a needle, and they are firing just fine.
Bottom coil as a system is very challenging because of the various thicknesses of different juices. I'm vaping 70/30 VG/PG, but I do dilute the VG with 10% of distilled water, so I'd think it is pretty much comparable with a 70/30 PG/VG. Wicks okay, but it's not a fog machine any more than a Vivi Nova, Kanger carto, or the Phoenix RB eGo Tank.
Bamboo wicks do not seem to work at all with T3. They wick way too well, and will flood the coil and leak, even if the wick is so tight at the casing that it will give dry hits. Bit disappointed because of that. Although, the factory setup does taste quite a bit better than the burning grommet on the Vivi Nova.
All in all, I'd say the T3 is comparable to Vivi Nova (Mini). T2 not so much. Vivi Nova might give a tinkerer more playground, but for the plain users, T3 might be better. At 8cm it is the tallest ato/clearo I've seen. Looking at the design I'd say they could've done 6cm easily. A mini version with 1.5ml tank could measure 4.3cm. I would've definitely gone with those instead. I might end up sawing 1cm from the mouthpiece, as I don't see how it would disturb the performance.