I have used everything from pumps to autocockers, Raptors to Impulses and everything between.
Right now I have 3 guns a Razorback pump, BrassEagle Raptor and a 32 Degrees PT Extreme.
None, the Vector is by far the best gun I have ever used.
The Vector has a simple setup that even a child can care for. The quick release barrel is awesome this makes cleaning easy, the front stock is a nice feature that is a great safety piece over the hoses. The rear mount tank is a nice way to craddle the gun when you are belly crawling or taking a stand. The noise is a little loud compared to other guns but that is the menacing charm of the Vector. It is a real intimidation factor. The weight is well balanced when you have a tank larger than 12 ounces, I recommend a 20, and have a cap on the back of the tank. Once again I just want to reiterate the fact that this is a low maintinance gun and even my 4 year old nephew can operate and care for it, which tells us what mentality level Chris is on.
There are no bad features about this gun. The Vector was created by the GODS of paintball for all to enjoy, unfortunately the Vector has since been discontinued and that makes it very difficult to find parts. The only part that I recommend you try to find if you have or can get a Vector is the "thruster", which is the velocity adjuster.
If you can get your hands on a Vector and purchase one, please yourself a favor and get it. It is the best marker I have ever had the pleasure of using, and when my friend desides to sell his you know I will be the one to buy to it.