I have had RN4081's (overpriced junk from the Mall...my very first eCig), DSE901's, KR808's, various homemade Mods (3.7-6.0 volts), and every 510 set-up imaginable and almost all of these in auto, manual, and in Pass-Thru form. I have the CE-2 R4's and CE-2 R4 Syringe Mods (made w/ 3ml(clearomizer), 5ml, and 10ml) and as I sit here typing this I just removed my new MAP Tank (w/ 2.8ohm 510 CE-2 R4 internals) from my 5 volt Box Mod and put it on a 510 (in-line battery) Pass-Thru. Both are wonderful but my all time favorite setup (for Home Use and Travel) is a Mega/XL 510 Atty w/Blu-Foam Cart Mod on a eGo battery. They make nice cases you can carry with you and a button protector so you can put it in your pocket but I made a lanyard/necklace with the ball chain from my dog tags and an o-ring, its not perfect but it works. I tend to like a cooler vape but I still need good TH and Vapor Production and this is the set-up that does that for me. I still haven't bought an eGo Pass-Thu or a Mega/XL eGo Battery, that's because I still have 7 brand new 650mAh eGo batteries and 5 or 6 in circulation that are still good (3 of which are basically brand new), but I think I'm gonna order at least 1 PT and 1 Mega eGo this coming week when I order the new Joye/Ovale Tanks System (T-eGo) this week from Totally Wicked. You should really give this set-up a try...you won't be disappointed.