Looks like Maverick answered all of your questions. I don't use HPA so I can't comment on that either.
Hmmm, I've had some good experiences with my Phantom VSC so that's a toughy One particular game comes to mind: we were playing speedball, something like 20 on 20. On the left tape, I was up against a Spyder EM (electro) and I managed to snap-shoot him from about 20'. After some more fighting, it was down to three of us and four of bad guys.
Before I knew it, my teammates were taken out and they had removed two bad guys. It was now two on one. I topped off my paint, dumped the CO2 and popped in a fresh one. The two bad guys were behind a single barrel structure.
I fired a couple of rounds at them and ran to a new position. As they stuck their head out, I fired again. When he reeled back behind cover, I moved to a new position, closer to their barrel structure.
Finally, I fired off a round again and ran right up to them both and convinced them to surrender. What was cool was that a private group of about 30+ players were all lined up against the netting watching and they cheered after I got the surrenders.