Don't be afraid to
buy just one atty at a time (though it's better to have a spare handy). I bought a 510 LR atty from Shawn and it last me almost 2 months. The only reason it died is because I decided to try to take the bridge out. I got it out, vaped it for 2 days then it died. So,
vape in confidence with Shawn's gear. So long as you don't
vape the atty dry, he's got decent lasting attys.