I started with an NPro (mini cigarette style), but quickly went to an 801 penstyle!! Yes, agreed, they're the best if that's your only choice ~ But then I went to a Janty stick (Joye stick as well) they use 801 attys, much more economical battery ($4). And very compact, for stealth vaping!! No more worrying about dropping a penstyle, or breaking in my pocket. I bought a few hundred $$$ worth of 801 batteries, and at $14-18 each got really tired of replacing them. Now there's an 801 cartomizer, which I love, no cartridge or filler to mess with, and they hold LOTS of juice, still have the nice cigar-tips, also called whistle tips. (801 carto @$2.49 from Mad Vapes.)
My choice, Janty Stick with 801 Cartomizer. Battery life is still only two-three hours, but I'm home all the time so no matter about that to me.