I've had Powerslot's on the front (278mm) for over 4 years and 25k miles now. No warping or squealing, but a bit of a groan under hard braking. I put in new stock Ford pads with them and they are about half worn now. I see no problems in using them at all. The right one even survived a seized caliper for a few miles. I have had to clean the grooves every 6 months or so though.

96LXV6 heavily un-modded due to family addition. 87Renault GTA convertible, chopped springs, Ford Premium Sound, but otherwise stock.