I ride a Yamaha YZ250f.
I bought this chain to go to Little Sahara dunes. I bought it so that my regular chain wouldn't get ruined by the sand, and also so I could run my rear tire further back and not have the paddle tire crack off my mudflap.
Chain worked great, but after 3 days of riding I swear the thing must have stretched a solid inch. side to side play after 3 days of riding is beyond anything I've ever seen, even my R6 chain with 13000 miles is in way better shape.
TL:DR - buy this if you're not going to use it more than 5 times.