I use a Bob Marshall endurance and LOVE IT! I don't think I can ever go back to a treed saddle again...
One warning with treeless saddles though, unless you're light weight, your horse has GOOD muscling
along the back, AND you have one of the newer saddles that has build in pannels, you need to use a specialized pad to create spinal clearance and distribute weight.
Bob Marshalls, older Barefoot saddles (made 2007 and earlier), and other saddle with no internal weight distribution system do best with Skito Treeless pads
with the laminated foam option. I use one along with a ThinLine pad
to stop slipping and aid in weight distribution (I'm a heavy rider).
The Skito pad without lamination is a good choice for lighter weight ride or a treeless saddle with an internal weight distribution system (like a Sensation, Freeform, newer Barefoot, etc.).
Other popular pads for treeless saddles include Equipedic
, Christ treeless
, Toklat Woolback w/Ultra Cell
, and Supracor
. All of these pads have inserts to create spinal clearance and absorb impact. Which one is best depends on your horse's conformation, the horse's fitness level, your weight, your riding level, the kind of riding you do, and the saddle.
Not ALL treeless saddles work for all horse and rider combinations. It's important not to get frustrated if the first saddle you try doesn't work. It's important to evaluate your horse for fit as soon as you recieve your new, used, or demo treeless saddle.