OK, always wanted one of these since I got into paintball, a 99 Angel LED, with a single finger 45 frame and stock Jacko barrel. Bone stock as far as I can tell

Never had one, and no one around here has had one, so Im wondering what I should look out for?
Upkeep? Ive seen the manual, but is there anything that 7 or so years of experiance would tell me?
Should I get my one HPA tank hydro'd and get an LP reg for it? Or just dedicate a CO2 tank to it with a AS tube? What do they prefer?