I only tried Crystalair. From my Interneting, it's more of a full time organized school. The others are part time. Having to share equipment, getting aircraft time is always an issue. You have to book your seat beyond the soaring forecast can predict. And as you've guessed it, there is a pecking order. If you can go out on weekdays, you will have a big advantage learning.
It's super fun, go try it. 3 axis control, fast, super glide.
It's also not as fun as HGing. You're all crouched down in a fiberglas canoe. Tall tows are expensive. Nothing like hooking a thermal in a HG. Coring a blue-topped thermal and going to the moon in a HG is just better. Coring with swifts and vultures tight against a foreign hillside.
I think my earlier analogy was best said: "It's like having sex

but with a condom on

" Takes away the best part of flying a HG. Still, go check it out. I think it was worth my investigation.
Oh and on the money issue. If you have to buy retail aircraft insurance in one year chucks. It's like 450$ if you fly a lot or a little. Oh and FAA background check thingy. Terrorist in sailplanes, Lol. "OMG, that talibani has us on glide. Hit the deck!"
When I get old and my dick stops working I'll fly sailplanes too. Until then, I'll see 'yall around Kagel.