From the giving credit where credit is due dep't:
Just finished installing a set of shower doors for a client. They bought them (online from Home Despot). Fairly simple kit, from Maax (a Canuck company, it turns out), but there were some "gotchas" in the installation, of course, like one wall that wasn't exactly plumb. So I ended up calling their toll-free tech support line, which was duly answered. (Basically the advice was "shim it", which is what I did.)
The product is good: aluminum frame members, doors hang from top track on nylon rollers. Everything fits together nicely; good provision for caulking; manual is clearly written (hey, it even says "Measure twice, cut once" a couple times). End result is good-looking and smoothly functional.