I've had my '03 Vinson 5sp for a few months now,and so far so good.There are about 500km on it now and I'm pleased with it up to this point.The only problem I've had so far was getting it from low to high gear,it did this twice.When putting it in high range,it wouldn't engage,I thought maybe the idle was set a bit too high.It hasn't done it since even though I didn't adjust the idle speed.I am getting a bit nervous since I'm reading about a lot of problems with the Vinson(gearbox,cracked frames)mainly on another forum,atvnation.Personally,no real complaints yet.Love the power and handling of this quad so far,this is my first atv.I bought mainly by price,if money were no object I would have looked seriously at the Rincon.All the Vinson reviews I've read were positive.
I'll keep you guys posted...

 

Congratulation, I have a vinson 5 speed also. The machine is awesome. I have'nt had any troble with it. I got mine in March. I have 317 miles on it. I put 112 on it this Memorial weekend. It's a great machine.