I bought a TPX new. The first day I got it in, I was sooo excited. I had went out and bout some cartridges, and even some higher quality paint.
First Clip: ~Kind of a pain to load, then I figured it out

~Would not puncture CO2 cartridge, had to take apart pin punctuator to grease it better. (Later found out there was a recall on that...)
First Clip, Second Try: ~Finally shot, but after 2nd shot, (as in, on the third) it unloaded the whole mag in a single shot, spraying paint for about 10 feet. I was not impressed.
Second Clip up until the time where I said screw this...: Looked at FAQ's about the problem, called Tippmann about the problem (They were clueless). It did the exact same thing with both mags. I do not know how many times that I squeegeed that barrel. Decided that it wasnt worth my time for something that I wouldnt use that much anyway...
Pros: 1/4 turn CO2
8 Ball Mag
Made by Tippmann
Ability to add remote line
Punctures on first trigger pull ( Unless it's my old TPX, lol... )
Has A5/X7 threads, so you can put an APEX or whatever you want on there.
Cons: Bigger than I expected
Had massive issues with the paint spraying
Heavier than most PBP's
Pricey
Overall: I would use it, if I could get it working, and I would deff use it for a separate game (Speedpistol) However, gun didn't work all that great, so ended up selling it on Ebay.