well said james. probably one of the reasons I see so many of these and we replace quite a few as well, at least down here, is that these fixtures are stocked at several home lighting showrooms and distributors that sell to electricians. While I would say they are a solid step up from a big box store fixture, but not quite a best quality fixture out there.
and although hadco fixtures come up short, I have nothing against hadco transformers so far. guaranteed for life, they have performed flawlessly in the field so far and we have quite a few out there.