My T7 arrived about a week ago, I love it, From the first build I've had no issues, dual coils, fill the deck with cotton, and vape! I do agree it is a bit of a pain to fill, having to use a syringe or needle bottle isn't that bad, but digging that screw out for every fill is annoying.
I also picked up the T5 which arrived yesterday, one thing really nice about these, they come very clean, so clean I didn't bother cleaning the T5 :O. Probably the main reason I only gave the tank section a quick rinse is that the T5 came prebuilt. The build is pretty nice, and has a huge wad of cotton, it vapes really nice, the prebuilt it arrived with came in about .7 ohms.
I love both of these, I have a long list of other atties, multiple Kayfuns, Taifun, Heron, Big Buddha, Russian, Oddy, penelope, Spheroid, ByKa, Ruzgar, Mirror, Aqua, Fogger V2, V4, on, and on... The T5, and T7 are near the top of my list, if not for the filling hassle, these would be near perfect. One thing I really like is the airflow, pretty nice!
I would still probably recommend a Kayfun for first timers, or inexperienced users, but once you know the build basics these are great. Its probably experience, I think I learned the most experimenting with the Fogger V2, if you can build that thing, you can build about anything!