I plow through few hundred shots in one session frequently, getting to shoot more continuously without disruption is a nice feature to have, same reason why i prefer higher capacity magazines so i get to keep shooting longer, and I don't have to swap out the pre-loaded magazines as frequently. The 28 shot magazine in .22 is one of the main reason why i went with M4 over all other PCP out there in similar price range. i would never ever buy another PCP gun with magazine less than 15 shots, ever!
I don't have a tank, refill from CS4 compressor takes about 9~10min from 100 to 250 bar if i remember correctly, it just seems like it took ages! lol Eventually, i probably would want to invest in a tank and bigger compressor but for now, the 580cc tank is my hotswappable spare, so i could simply swap out the 480cc and keep shooting and don't have to refill, for a longer shooting session.
Maybe what I really need is to get a 9L tank and just tether the M4 off of it, for non stop shooting fun, with least amount of interuption.