I love my P+16. It is my daily out and about mod and I wouldn't trade it for anything. I usually go through 3 batteries in a day if I only use that mod, but it performs very well.
One thing to note: don't over tighten cartos on it, it is possible to cause a short by doing so. Also only use quality high drain IMR batteries such as aw, or protected Li-Ion's. Actually ultrafire 16340's won't even fit.