I have a Solution Treeless and yes, it has a gullet.
It is a very nice saddle. I couldn’t ride the Ansur Excel as the thigh/knee blocks were too straight and my hips are too stiff to open in that way. The Solution allows you to put the blocks where ever you need them.
My mare (Andalusian cross) has filled out behind the withers nicely since I have been riding the Solution. Prior, in her old treed saddle she went fine one would say but I didn’t realize just how hard I had been “peddling” to keep the forward. In the Solution, she just goes and I can give much more refined aids instead of pumping all the time just to get forward.
Idaho is pretty much a saddle fitting wasteland…as in we have no fitters within 300-500 miles and their appearances are few and far between. I use a Thinline shim pad to balance the seat for me and I am a happy camper.
Susan