I don't have the Sequoia swing but I do have the older Petzl Mini Boss which has the same boson seat. Very comfortable when you get it adjusted right where you want it. Actually the most comfortable saddle I have worked in. You can adjust it for a snug fit and it's not too much different than leg loops, a lot more comfortable than loops though.
If you look at the pic in my avatar I am kicked back reclining in the saddle. Very comfy with the stiff battan seat.