I've not put in that much time with an SSB in the past, but have used the Elite FTS one several times before. I've never liked the way it folds you over on grinders and throws the centre of gravity off way too much compared to a back squat.
I understand that if someone is trying to work on support strength for a multiply high bar squat then it would be useful but it always sucked for doing rep work
Well, happily I can say that the Edge SSB is nothing like that. The COG seems much closer to a real back squat and even in Oly shoes it doesn't try to kick me forward on every rep.
Highly reccomended, very well made and I'm planning on doing 90% of my squatting with it from now on.
The sleeves run a little small but it literally only takes a strip of duct tape to widen them enough to make regular collars bite tightly
https://www.youtube.com/watch?v=quLvJFrO6R4