The only issues we've had with HSD's have been distributor error (i.e. incorrect brackets fitted), and a couple of sets with loud pillow balls.. (although nothing that is out of spec for a coilover i.e. most pillow balls will make noise in some shape or form, either way we replace them at the customers request).

Apart from that, mechanically, they are spot on!

PM me if you're interested.

They cost more than those eBay ones, but I can't imagine how bad those eBay ones would be.. I'd hazard a guess and say stiff, noisy and difficult to source parts for if required.