Big fan of the kevlar ones in my XTs, they don't do anything interesting though, they just work better than OEM XT pads at a fraction of the price. Same goes for the sintered for that matter. Though the thickness of the paint on teh kevlar ones did mean they didn't fit properly, and had to have a little paint chased off with a file, which is irritating and unneccesary but took 5 seconds so I don't mind.
Disco don't sell the same pads, at least, the Disco XT sintered pads I had were visibly different to the SS ones, and didn't provide the power either. Though they did seem to last a little longer, but I only went through one set on each end which isn't really enough to judge wear.
As far as delaminating, I've had EBC and Shimano pads delaminate, and one of the sets of Discos was always shedding little chunks, though nothing major. Never had a SS set do it but I'd not be too surprised or horrified if they did, as far as I can tell it's just something that pads sometimes do.