Ryobi is probably fine for hobbyists. Industrial workers seem to stick with Dewalt or Milwaukee IME. If I was doing anything serious I'd steer clear of Ryobi.Definately older than 5 years ago. Smoked an impact driver within an hour and fried a fein saw in under 10 minutes. The Fein saw fiasco was an after hours job and basically ruined the entire night. Needless to say, the quality just isn't good enough for me.
For someone stocking some part time garage tools for the occasional repair etc I suppose they are a reasonable option. Most of my Milwaukee tools are going on 14 years of hard labour. I've ruined two of their cheaper drills coring holes, 2 of their hacksawzalls cutting steel or pipes with water. The impact is original, still works, and so are the batteries.
I think for hobbyists that use them a lot, Ridgid is the best brand due to warranty and having some great tools, but they definitely have a smaller selection than Dewalt or Milwaukee (milwaukee esp if you do lots of plumbing as Ridgid's power tools are a separate company from their plumbing and piping tools).
Pre-post edit: Ninja'd by SugarJ