I've got a good range of Ryobi One+. Drill, hex impact(2), circular saw, sawzall, multi tool, grinder, jigsaw, 1/2" anvil impact, hand light, flood light, fan, and both radios, miter saw. Half dozen batteries. Everything has worked great. Not pro use, but have done everything from small house projects, to building decks, remodeling a couple kitchens, working on vehicles, woodworking, etc. I feel they are amazing value for their price point.
My parents also have a large range of their tools, Lots of the power tools, and nearly their entire line of outdoor 18V and a number of 40V tools. They are not gentle on them, but they have been holding up great for the past several years. Things like the 10" chainsaw has gotten many hundereds of hours of use and just keeps going. My mom's cleared, purned and cleaned up all kinds of things with that saw, sicne a gas saw is too heavy and she can't start one. I've used alot of the outdoor equipment helping them around their 9 acre property and really like them. Compact, light easy to use. Obviously don't have the power of gas tools, but you can do alot before you need to break out the "big toys".
I'd say comparing them to the current crop of Milwaukee or Dewalt is a little unfair. The Ryobi line is really aimed at a price point under the bigger name tools. They are solid, priced well and allow you to build a lot of capability without too much out lay. I've used all three, and I'd personally say the Milwaukee and Dewalt lines are well worth their price, but if you don't need all thier capability, then the Ryobi line offers a good alternative.
~Carson