I have to agree with all the comments on the superior qualities of the Darwin. I vaped on it most of the night with both an 801 cartomizer and an 801 atomizer. Besides being the easiest PV to vape, it's just how incrediably consistent it is that amazed me. After 3-4 hours of vaping on it, the last inhale felt the same and just as good as the first one. I think this PV really is a leap forward in vaping technology. And it is not nealy as big as it appears in the pictures. It has a very good form factor for your hand. And it by far has the most solidly built feel of any PV I have ever held in my hand. This PV takes all the guess work out of vaping.