3 bosses, two were customs on a RMK and a summit rev. They were good. The boss pro RMK seat I put on my 11, in 10, no so good:
+ Lots of storage. Too many compartments.
+ Width is perfect, narrow in front, wider where you sit. The 13 pro seat was modeled on the Boss, the width and length dimensions are almost exactly the same. Boss seats can be +1 higher than stock. Some don't like this. I don't have a problem with it, but I can still hop all over a sled pretty easily - I rode a summit for years.
+ Light enough, attachment system worked great 3 seasons, at least for me. Never came loose, and I kick the crap out of it.
+ Much shorter than the stock 11-12 - those were like swinging a leg over a long 2x4, and about as comfortable if you sat. Worst seat ever produced by an OEM.
- Biggest issue - the side material between your needs legs builds ice 'balls' where your knees rub after a couple hours in the pow. You ride the rest of the day with two ice packs between your knees, constantly pushing on the ice when you lean, or kick the crap out of the seat to break them up. This is SERIOUS downside, if you play in the deep alot. I've sprayed, coated, about the only thing that works is putting gorilla tape over the stupid fabric between your legs.
- Same material responsible for the above frays. Looks like 80's patagonia fleece.
- Zippers are fragile, at best, many have failed (this was the 10 subbed out seat for $350, supposedly better for those made in 11, but much more expensive in 11)
- Boss is the best example of No Customer Services in the industry. And that's saying alot - the sled biz has had their share of pirates and castaways.
- It's been stated here that Boss is not returning calls now. The golden goose may have been cooked and eaten. If you find a Boss seat you like, expect even less customer service, if that is possible.
I like the Skinz myself. I'm another never-again Boss customer. After 3 seats and +1500US. They self inflicted all their wounds.