Here's my 2 cents -
The only tried, tested and I mean TESTED (hardcore endurance riders) that I've personally heard are worthy are Barefoot, FreeForm, BlackForest (just begining to make a name for themselves)and Torsion. More western would be the Bob Marshall. I might be forgetting one...
The others are cheap and don't use real leather, and the hardware is nickel (rusts) and they tend to put seams and hardware in all of the wrong places, and some are not much more than what I've heard people call 'glorified bareback pads'.
With that said, I'm actually considering the Tahoe myself....
There is a great article out there by a girl who got all of the treeless brands, took pics and wrote her thoughts down on them...a good read! Here is her link : Treeless Saddle Reviews - The Alternative Horse
A treeless saddle also requires a decent pad to help provide pressure point relief from your bum and to distribute your weight better - it also is required with some saddles just to keep them from bridging on the pommel or other areas. Once you get a nice pad under them, they sit where they are supposed to and are quite nice.
Keep studying! But expect to pay no less than $500 (for a good used one) and more for the new ones. Hope this helps.