Well, generally in order, I've used:
- Standard eGo (650mAh batts) with 510 atty/cart - Worked fine for a few weeks, got tired of small carts always running dry.
- eGo Mega batts with mega (type B) atty/carts - Worked much better, was my favourite combination for quite a while.
- eGo-T (Type A and B) - Didn't work for me; muted throat hit, muted flavour, anemic vapor.
- eGo batts with dual coil cartomizers - Replaced everything I'd used before, loved them.
- 510 with cartomizers - Got this for my wife, she didn't care for them, but I used them for a while as an alternative when I wanted something small and light.
- eGo batts with eGo Mega Dual Coil Cartomizers - Replaced regular dual coils and are still my favourite cartomizers.
- Currently using ProVari with the above EMDCCs. Awesome combination. Going to try the CE2X Fluxomizer Deluxe next.