I'm really liking my authentic Mephisto v1. It's fairly compact compared to the CLT that I had been using (although don't get me wrong, I like the CLT 2 as well), and the giant post holes make it super easy to build on. Flavor is good for an rda that most seem to consider a cloud-chaser design. And as a bonus, it looks awesome with the copper AFC on my copper SMPL.
The main detractor from it is the cost, but clones are readily available and some of them are apparently pretty decent. I just got lucky and was able to pick mine up in a trade.
X20 but authentic only. I have long not used my AFC. It's useless other than for eye candy. M E P H I S T O Posts never move so you can torque your wires endlessly. Huge post holes and the cap design creates incredible vapor and flavor.