I tried a lot of different saddles before buying a treemotion without having ever climbed on it. Buying a saddle is a very personal thing, but the 2 biggest variables are your size/weight, and the style of climbing you do (on spurs, hitch climbng, limb walking, a lot of rope hanging etc).
Im a fat bastard, so I was looking for a big fat padded saddle. I'm also a gear head, so I wanted to be able to carry a lot of stuff. Most of my work is technical, so I do carry quite a bit.
My initial impressions of the treemotion were really good. I'd only ever climbed on fixed bridges before, so the floating bridge as a real revelation to me. I was also very happy with the padding, leg straps, and infinite number of gearconfiguration options (still playing that that!). So far I've got a couple of carritool beeners as well as a few gear loops that I'm experimenting with. I don't carry tools on my leg loops (anybody?). I'm not overly impressed with the saw clip in point, It doesnt carry an 044 let alone an 066. I don't carry a first aid kit in the tree, so that isnt a big selling point to me.
My biggest let down with the treemotion has been the sizing. There was very little info available from aus suppliers about sizing, but all suppliers assured me it was big enough. Aus websites listed it as being suitbale for my size/weight, but when i received the harness (nobody in my area stocked it) and read through the manual I found it was recommended for 30"-36" waist and 220lbs. I'm a 42" waist, and 240lbs.
Much to my surprise, the treemotion fit quite well, so I guess their sizing is conservative. I do wish the rings were further forward because after any more than an hour in spurs leaning on a flipline, they start to dig into my hips. I think this harness would be really idea for someone in the reccomended waist size, but even for me it does quite well. If I had my choice again, I'd probably get an ergovation, because I think from memory they make one in my size.
To add insult to injury, they dropped the aus sell price by nearly $200 about a month after I bought mine.
I've never climbed on a cougar, but I think they are more suited to skinnier guys who move around in the tree a lot. I think you'd suffer if you spent a lot of time hanging off a rope in one.
Shaun