I've had mine going for 2 days now and I'm thrilled to have it. By far the best thing to me is the consistency of the hits, every single one is fine (every once in a while you get an extra special one.)
I don't have any of the "problems" I thought I might based on pre-release reading. It doesn't drink juice to a bothersome extreme, it hasn't damaged an atty, I don't have to be careful not to get too big a hit. My technique is to take a normal hit, but release the button a bit before done drawing. Probably a 2 second draw with button (which is depressed on it's journey to mouth.)
I'm using both the supplied batteries and my own 3.7V. The first, I don't know, say dozen, draws on the 3.7 (which charge to 4.2V) are a little harsher than the 3.0, but then they settle down and I can't tell the difference. I plan to keep 6 pairs in rotation (including the 2 supplied) so they'll have a day or two off the charger to settle which should help get to the good stuff sooner.
It gives its best hits, to me, when it's quiet. Too soon to tell, but when it was really gurgling it had a lot in the cup and after I shook that out it was quiet and obviously smoother. I've seen the same thing several more times with the quiet = smooth hit. That's the only time I got a bunch in the cup though.
It looks like any juice at 20mg or more I'll have to cut a little. 10 - 15% reduction seems about right for me. In other words, I normally vape around 20, but with the PV 16-18 is more comfortable. I got some 36mg Virginia though and I'm going to try that straight just because.
I thought I'd have trouble getting used to the button, but having some .... experience in my youth, it just fell into place (the button functions for me exactly like the air hole in a .....)
Wish list:
My second one gets shipped really fast
An adapter for the 201 (if that's even possible)
That's about it (it would have been nice to have the battery end knurled, but not that big a deal.)
Oh, the best thing of all - built in anti-roll control!!
Edit: I guess I should add that I'm exclusively 801.