Way back when I had them on my 2006 Apex 121 (bought them used and put 3,800 miles on them). I really liked them when the sled was moving - they felt really secure with little if any darting. You could comfortably ride with one hand on the grade trails.
When the sled was stopped, it was another story though - I could not turn the handlebars when the sled was standing still. I'd have to get off the sled and yank the loop to turn em.
Obviosuly different sled, with different geometry, but I bet they will be similar on the Nytro.