My experience with the Visco-Lock hasn't been good. The system takes too long to engage and locks up one tire. In my oponion, nothing beats a diff locker.

 

I have owned one for about 4 months and love it. The bike rides well, and after about 200 miles, I had to re-adjust the shocks from the lowest setting to the second one to stiffen the ride up. It is a little long on some trails, but I think the extra length helps in mud, because your tires hit the holes in a different spot. Also remember that your passanger sits about 8 inches higher so remember to tell them to duck.

 

I've own one for just over 6 months. Have 800 miles on it love it. Only been on one ride without my lady and I love it. Only draw back is speed but 45mph at a easy past is awesome.
I've had some small problems, and so wiring problems. All the cheap a$$ fasteners came out.
some nylon loc nut and some new bolts problems gone. I brought mind for one reason. I'm with a lady I enjoy doing thing with and thats what we do. For two people to get out and enjoy it's agreat bike. 800cc whats the race I race in day to day life. 500cc some I can build it better that the oem. I could not be happier. Works just a good one or two up. The wheel base make a dream of a ride. Will say it's hard to get through some trails. But you'll be a better skilled rider, once you get on to it.