I have the 702PCC. I don't know what model the
ecig is, but I know for sure that m702 is the PCC model number and not the
ecig. I love it. It vapes really well and does what I expect it to. I decided between that and a 510 my buddy had. I get more vapor than he does with this thing. But, that might just be the way I vape on it. It is a rather small ecig (a plus to me, I wanted one that was realistic to an analog with an auto batt). It was pretty cheap too. I got it at Revolvercig.com. I don't know anything about the 402 to really comment on it. I tried a ton of these things and I remember my friends having me try a 401, but I'm not sure if any of the ones I tried was a 402...
Anything with a PCC is a huge plus in my opinion. Unless you don't plan on leaving the house with your ecig. I would see that as a pain not having something to carry it in with extra batts, carts, and a charger if you will be out for a while.