I got them on my 660, I love them and they are definitely worth buying! I agree with speedfreak though, they are soft and I really only ride the PA coal mines in hazleton and the rocks their really tear em up! They should last a while on your 250 though, what kind of riding do you do?
I've got Razr's and honestly the only thing I like about them is how they do in the snow and mud, and they've worn like 1% since I bought them. That said, they are too firm and the hook up is very minimal. My other decision was the GNCC and I would like to try a set.
I had those on my 700 this summer. They are good for garbage now, pretty much don't have any lugs left. They've been a good tire, they have amazing control when drifting. I'm not impressed by their forward traction though, it's pretty hard to wheelie with these unless you are on very tractable ground because they want to spin a lot.
The best thing about them is that they are both pretty resistant (6ply) and pretty light, so they are pretty nice overall.
I will be running something with a bit more forward grip next year...