No, they delaminated if you ran them fast down a low snow trail. If you run them at high track speed, like on a turbo, in the powder they are fine.
In my opinion, the 2.52 pitch Polaris Series IV 2.4" track... the one you are looking at, is the best track available for powder riding. I ran the 166 for 2 season on my 910 and it was awesome. I now run a 159 in the same track because I wanted a little shorter one. I have a 151 on my 660.
sled_guy