Spyder Compact, Tippman Carbine. I also own an Expressed Cocker and an ELCD Automag P/F for backup. Of course the Black Knight can't compare to the Mag and Cocker, but it is really the player.
Can't really upgade besides getting an adapter for different barrels.
This gun truly feels like real gun. Heavy trigger pull and recoil. It feels powerful with each shoot and loud as h*ll.
Not a bad gun at this price, as long as you are having fun, that's the point. It is not a tourney gun, so don't compare it to one. Too bad the upgrade option is almost none existent.
Although it is a fun gun and not for competition use, you still can play with with the "big" boys and girls. Don't let them intimidate you with their expensive toys. Be patient and wait for them to make a mistake and make your move. I once had a fire fight with a guy shooting a Mag, I ran out of ammo. I dry fire and and then ran out of air. I rushed around to his bunker and aimed my gun at him pointblank, he surrendered (thank God). Unfortunately, I can't recommend this gun because there are many companies out there making far cheaper upgradable guns with the same performance.