I haven't ever owned RKA luggage, but can't remember reading a single negative comment on them.
I'm on my second RKA 16ltr mag. tankbag, and still use their 47ltr. saddlebags (bought used in '99). They are great products, and the owners are real enthusiasts. I've been to their store (old location) while on an extended tour, and they replaced my saddlebag raincovers for free.
I do have one negative comment, however. The magnets in their tankbags are not as strong as they should be, which I found out after having a mag. tankbag from Fieldsheer, which has hugely powerful magnets. I now use the RKA only for day trips or around town, while the Fieldsheer goes on for the longer trips.