Got 40 miles on my 850 the other afternoon. Really liked the sled. Skis are ok for stock skis, but I think there is better. Have really liked the the Polaris gripper ski on my other sleds and happened to have a spare set in the garage. Here is the comparison. The two skis almost weigh the the same. I was surprised the doo ski was slightly (couple onces) lighter. The keel on the doo ski is very deep, about a 1/2" deeper than the gripper. The gripper ski is a little wider, about 3/8". The gripper bolt fits nicely through the doo spindle. I was very surprised to see how almost perfectly the the doo ski rubber fits in the gripper ski, almost like it was designed to go there. Haven't riden with the grippers on yet, but will report back after.
850 ski doo ski weight
Polaris gripper ski weight (with doo rubber installed)
Doo ski width
Gripper ski width
Doo ski on left, gripper on right
850 ski doo ski weight
Polaris gripper ski weight (with doo rubber installed)
Doo ski width
Gripper ski width
Doo ski on left, gripper on right