I find the Momentum AL Harness to be extremely comfortable. Its' molded foam waist is very supportive on my lower back. I recommend the Momentum Al-(Adjustable Leg Loops) they are much more versitile, especially when nature calls.
I like this harness a lot, other then one thing that bugs me. Since you always have to double back the strap, mine has started to split at the end where they have the protective end tab. I prefer the speed, where you don't have to double back. All in all it is a very comfortable harness though.
Bought it at the beginning of high school, and it's still working hard during my years in college (so almost 5 years total). It has seen a lot of use indoors and outdoors, in sun, in snow, on ice, on TR, and on lead. Still runs securely, but I think it's gonna hit up the golf courses in Florida real soon for some retirement action. For the price, it's a great harness.
The only down side is its discomfort on when sitting around for long periods on hanging belays, but that's something I would assume is common to most harnesses/"harni."
My only point of comparison is the Bod - which I like a lot. The Momentum (I THINK I have the AL version) is comfortable. But I still find it annoying to get into because both leg loops are connected to the belay loop. I'm also still getting used to having a belay loop. I'll probably keep this for all around climbing, but also replace the Bod with either an Alpine Bod or with a Couloir.