I have both a LJ and a very expensive Ansur treeless saddle. . . . They ride in a remarkably similiar manner. The biggest difference, about $1500. The LJ is a little softer which makes it very comfortable mile after mile. (And that isn’t a bad thing at all.) Of course, one looks like a bareback pad and the other looks like a dressage saddle….but your seat won’t notice much of a difference.
You can sit anywhere you want on the LJ, so if you want more of a chair seat, you just slide back a little. If you want your feet more under you, then scoot forward. It is remarkably comfortable and secure. Both saddles are extremely comfortable for the horse. I ride my Ansur during the summer when the weather is dependably nice. I ride my LJ the rest of the year. Both saddles stay put equally well in the North Idaho mountains around my home.
If you are looking for a treeless saddle that is very comfortable for horse and rider, I would suggest that you save yourself a lot of money and make your first one a LJ. It is a great saddle at a great price–and fully guaranteed.