I know what you're saying about reading nothing but rave reviews with regard to the TreeMotion saddle. I probably started climbing around the same time that you did, maybe a little later. I figured, why spend half as much money on something I might end up hating, just to have to spend money on the saddle I should have bought in the first place. So I bought the TreeMotion as my first, and so far, only saddle.
Which leads me to say I probably won't be of much help to you here, because I have nothing to compare it to. Like you say, people rave about the "adjustability" of the TreeMotion. I honestly think I don't know much about how to properly adjust the harness, but over time I've found a setup that works halfway well. The big issue I was having in the early going was with the leg straps causing me pain when sitting too long in the saddle, because of pressure on what I think might be the femoral arteries.
I like to start with the question of "What is causing me pain or discomfort?". Then think about what can be done to reduce or eliminate that discomfort. With regard to the leg straps, I thought "Kids sitting on a park swing can sit there all day in comfort." It's because the strap of the seat is under their butt, not under the back of their legs. The kids are resting on their gluteus maximus.
So I started thinking of the straps on my harness not as leg straps, but as butt straps. I shortened up the distance as much as possible between the leg straps and the back of the harness, so that the straps actually form a better approximation of a seat. That helped a lot.
In summation, I think the people on this forum you really want to hear from are those that used other saddles for a long time, before moving to the TreeMotion. They'll be the ones that have a proper frame of reference, and who can tell you how the TreeMotion is different or better than others they've tried. I cannot appreciate the greatness that is the TreeMotion saddle as well as someone else who may have used some really bad saddles, and then had the good fortune to be able to use the TreeMotion.
Tim