Which one theres quite a few, and it doesnt seem like many people around here have one. Most of Fasttechs are machined wrong, if those pictures are still accurate. If you look at the AFC, the airholes arent lined up properly which basically makes it a single coil only atty. Theres a couple that are done right, although in the review of the stainless one I was looking at, the reviewer said it was also wrong which really bummed me out as I was ready to jump on one.
I have the Angelcigs one, its a couple mm taller than the 1:1 clones but it rocks. Only problem is the insulator has a tendency to pop up, so I wouldnt trust it on a hybrid type of mech. No matter how many times I push it back down and tighten the 510, its guaranteed to be pushed up almost flush with the 510
threading a day or two later. The insulator problem can also lead to your center post spinning. Still it was a great atty for like $8, now theyre blowing them out at like $4.99. Was going to get another one, but Im just going to grab another Derringer instead unless I can get proof theyve updated it and fixed the center post.
Performance wise, its awesome. I love my Derringer, but the Bonsai beats it hands down in both the flavor and vapor department. I have mine setup as a single coil with a 26 gauge/2mm/0.8 ohm coil in it.