I've owned 3 pairs of SST 5's and one pair of the heavy, bulky 6's.
I have the 6 lx now. The stability is much improved and the leather is fantastic. Judging the 7's, they seem bulky like the bulky 6's. It ruined my free flowing fancy footwork.
My only complaint is the rubber heel on the non-sliding shoe is wearing fast. its very soft.
On all 5 pair of my dexters, Ive never had a problem with the toe cap area, but that is the nature of my slide. Dexters take a beating.