In the TK Series, I have the TK15 (S2 Version), the TK22 (original 650 lumen XM-L U2 version), and the TK41 (also, original version), and I love all of them.
I like the dual button switch setup (at the tail switch) of this model. It makes a lot more sense than the secondary side switch on the TK15 and TK22. I oriented the clips on both of those, in line with the secondary side switches, to more easily find them, in the dark.
I've been kind of spoiled by the amazing throw found on the stock Nitecore P25 (which is why I hesitated to buy many more P Series lights of theirs, in spite of the more compact form factor); but the Fenix lights have always been solid contenders, in the single 18650 realm, and I'd love to try this model out, to see how it compares with my TK15 and TK22.
I'm just curious about the tint on this particular XM-L2. In some aspects, I preferred the TK15 (XP-G S2...?), over the TK22 (XM-L U2), since it had much better throw, and was far more neutral, in tint, than the more powerful TK22.
The TK22 had a lot better flood characteristics, though, and the automated step-down wasn't for a full 20 minutes or so, which was very handy, in a lot of instances.
Anyway, I'm looking forward to getting my hands on one of these TK16 lights (This would make Fenix #11, for me); but I'll probably wait until I can find one, on sale.
Way to go, Fenix
p.s. Is anyone aware of when automated step-down (from the 1000 lumen turbo, to the 400 lumen high mode) occurs, with the new TK16? Is it thermal? Timed? They claim 1 hour, 10 minutes, but there's no way that can be continuous, at 1000 lumens, in a single 18650 body. That would be too good to be true :|