I've got a proclimb (12) that's set up like a 13, but with a 2.5 CE track. On DEEP days it's truly an awesome sled.... but anything less than 18" with a soft base and I HATE IT. (I ride mostly technical terrain, steep & treed stuff in general.)
I have ridden cat for many years, LOVE my M's, and the proclimb helped me buy a skidoo, which I considered to be the worst handling sled in the mountains.
I spend many days on the proclimb, and it never felt connected to me, natural. I spent 2 hours on the XM and it felt like a part of me... when I HATED doo style steering until the day I tested an XM.
I've ridden the 12, then narrowed, then stock 13 shock length, then shortened then relocated skid, swapped track, lost weight... I've given this sled a lot of chances and tried to make it work for me... but I just feel like they flopped with this sled no matter how hard I wanted it to work.
imo, 1/2 a day on another sled and you'll never go back to a proclimb.
Once cat builds a better sled again I'll come RUNNING back though... I LOOOOOVE their motors, and that's just a huge factor for me in sledding.