WGP AutoCocker, BS VM-68, PPS Typhoon, Tippman Pro-lite, ATS TS-1. The Vector stands out because of its accuracy. Just by sighting down the barrel, I am able to point the gun and hit what I am pointing at. The power stock certainly contributes to this, it feels as if it fits perfectly and points very easily. I have a BOA barrel with a nickel finish and it cannot beat the accuracy of the stock barrel, though it is slightly quieter. The gun is very stable when shooting, much more stable than blowbacks that I have shot like the VM-68 and the Spyder. Barrel cleaning is very easy because the barrel comes off with just one button-push, then you can swab the whole barrel, however, barrel breaks aren't very common because the bolt will not pinch balls. The trigger pull is very short and crisp, similar to many electronic trigger feels. I would describe it as a mouse-click. The trigger group is made of EDM-cut (electrical-discharge machining, used to cut very hard metals) tool-steel, thus it will wear much more slowly than other guns' trigger groups. This hardened tool-steel is certainly responsible for the very crisp trigger action. Finally, the gun is definitely a sleeper in its looks, it is not flashy and does not attract attention because of its looks, just because of its performance.
Marker is mostly stock. I have an NRG barrel (vertical feed), BOA nickel-plated barrel, but I still like the stock barrel best. The vertical feed obstructs my sight picture and the BOA is heavier since it is nickel-plated brass vs. the aluminum of the standard barrel. The BOA barrel is quieter because of the porting, but not that much quieter. I use the Air Power Powerstock with a Cobra coiled remote and Procheck slide check, running off of an Air American 3000psi 113ci bottle. I run ~500psi into the gun and get about 1000 shots out of a tank (usually filled to 2700psi from 3000psi SCUBA tanks ). I have used an Armson OEG sight, but I prefer to just sight down the barrel, it is quicker and just as accurate for the ranges I work at. I use a VL2000 motorized loader, you can definitely outshoot this loader, but it does a decent job of keeping up.
There are now a number of upgrades offered for the Vector by independent airsmiths.
Classic Paintball, run by Justin Beard (firstname.lastname@example.org) has all of the spare parts for the Vector, some remaining new Vectors, as well as the following upgrades:
Spring/Seal upgrade kit
Trigger job kit
Stainless steel screw kit
Advanced timing kit
The airsmith Dingo (email@example.com) does a modification to the adapter body in the rear that allows it to use standard bottle o-rings. The standard o-rings are prone to being sliced and it is hard to find replacements. Opening up the o-ring grooves allows you to use common bottle o-rings.
The airsmith Punisher (http://airsoldier.com/~punisher/) does a number of modifications to the Vector:
45 grip frame
Bottomline/Drop forward mounts
Sidesaddle low-pressure regulator replacement (allows use of adjustable 3rd party low-pressure regs like the Palmer Rock, ANS Jackhammer, or Shocktech FGP)
Valve and flowthrough modifications
Powertube flow modifications
Quick-exhaust elbows on the ram for faster cycling
Adapter to fit Phantom barrels
Other things as well
Finally, the airsmith Dez (http://www.geocities.com/dezignbolts/) makes replacement bolts that seal in the barrel, increasing the efficiency of the Vector.
BOA, Barrels of America, will make a Vector barrel that is quieter than stock, but just as accurate as stock (because the stock barrel is just so darn good!)
Reliability, does not come "out of tune"
No ball chopping, bolt will just stock if a ball is not fully in the breach, then you just reset with the safety
Very high performance without modification
"Sleeper looks," resembles an H&K MP5 submachinegun
Crisp, short trigger pull
High rate of fire
Very minimal movement during firing
Very well balances with a powerstock
No longer manufactured
No spare parts at local stores (but you can get them from Classic Paintball, firstname.lastname@example.org)
Not as efficient as other guns (though this can be improved significantly with modification)
Not a lot of bolt on parts to improve performance
This gun is hands down the best product I have ever used in my many years of playing paintball. The accuracy is top notch and the mechanics are so reliable, easy to maintain, and trouble free that it keeps me playing and not always fixing and tuning. The Air Power Owners Group (http://airsoldier.com/~apog/) is a fantastic resource for finding these marvelous guns for sale and to discuss upgrades with the airsmiths mentioned above. I would highly recommend this gun to anyone who appreciates the balance and aimability of some of the best firearms, something that most paintball guns lack.