I had a chance to demo a stock Catalyst 600 154" yesterday. Last year I was on a '22 Matryx na 163, this year a '23 Expert na 165. My favorite sled so far is the Expert. I have my Expert set up with an iBackshift clutch, finger throttle, shocks done by a local suspension shop, post forward, Salazz King ski rubbers, 34" ski stance and obviously I'm used to riding it. I'm 6'1" 205lbs. Snow conditions were mediocre with about a foot of fresh snow on a hard layer of crust and old tracks. The Catalyst looks small, the whole package is compact and it looks like a different class of sled size-wise. The first thing I noticed riding was how sluggish the Catalyst was off the bottom, it was an obvious delay, slow and weak to engage. I suppose this was due to a combination of the the small bore not having the torque of the 850 and the OEM cluching compared to iBackshift...sure made me appreiate the iBackshift clutch. I have no doubt that the stock 858 would be better and further improved with some clutching. The Catalyst 36" ski stance made the sled feel planted on the front end at slower speeds, heavier than the Expert although this could be due to the suspension setup too. I'd never ridden an Alpha rail before and you can imagine how much I over rode the sled, I felt like I was drunk at first. It took much less rider input to initiate. Sidehilling was not as precise or directed as the expert, no surprise there given the track length and skid differences. I rode the sled twice for about 30 minutes total and it was enough to make it clear that I'm not going to get an 858 until I've had a chance to ride the larger motor and longer track. Keeping in mind the Catalyst was a bone stock 600 and I only rode it for a short time never having ridden an Alpha rail before, I would not describe the Catalyst as a game changer and I much preferred the handling characteristics of the Skidoo. I'm not brand loyal and would like to try an 858 165. I'd be even more interested if Cat offered it in a dual rail setup as the Alpha rail would definitely take some getting used to. I have no doubt that I could get used to the Catalyst and probably come to like it, however there was nothing in my short demo that would make me want to buy an 858 for next year.