These are supposed to be indestructable. I've broke 2 so I figure it's not for me. Maybe if you don't hit the whoops like I did? I've heard of guys with lots of problems, and guys with lots of miles and no problems. None the less I have it and I ain't gonna run it. I have to sell this with no warranty or guarantee, it's brand new. $450
I can tell you the Powertrax LSD is a good rig. Put it on my Dad's 2003 Tundra, and has held up beautifully with over 200,000 miles on the truck. It may not be the cheapest, but it does allow alternate speeds with the rear end wheels when turning which is nice.