Been using a Riva 510 from Liberty Flights for a while now, and I'm kind of disappointed in a couple aspects. The battery life is great, and vapor production with VG ejuice is great, but flavor, throat hit, and heat are all VERY lacking... I've tried several different ejuices, everything from 100% PG to 100% VG, with a 70/30 PG/VG blend in there as well, and although the flavor and vapor varies from juice to juice, I still get literally no heat and no throathit. Am I doing something wrong? I'm using standard 510 atty's and cartridges; should I try cartomizers or maybe a LR 510 atty? Or would you recommend another brand/model? I picked up a cheap disposable ecig from a tobacco shop, its called the "No. 7" and it is a perfect balance of heat, throathit, flavor, and vapor. Kind of disappointing that the Riva I paid 5 times as much for doesn't perform as well... 