Well, I've been here since August of 2009 and was on a serious quest to find something that worked properly for me. Although many of these have gone bye-bye in The Classies, I have used:
801's
510's (standard atomizer with virtually every atty mod, atty debridged for dripping, carto, tank, clearos, pump carts, smart carts, G3's, etc., so on),
eGo's, eGo-C, eGo-T, eGo mini's, eGo-W (with standard atomizer, cartos, various tanks, Giantomizers, Mini Vivi Nova, DCT, & prolly others),
DSE 901's,
DSE 601 Pipe (for late husband),
KR-808-D's,
DSE 701 Gemini's,
Leo's (standard atty, tank, clearo, and cartos),
Lea's,
GoGo's,
XL3,
Greensound SOLE eLips,
Silver Bullet,
- and finally, what I use darn near all the time -
Volt (65's, 78's, and X2's with cartos, clearos, CE3's & Nano's)
Waving the white flag and in full retreat... Damn!

