I use these and their competitors, the Wild Country Wild Wires. Both are good draws but the Prowires have a significant edge in weight and I prefer the longer slings on them over those on the Wild Wires. The biners on the Prowires, though, feel smaller on the Prowires (even though they aren't) with the result that I prefer the feel of the Wild Wires when clipping. Much more of a personal preference though, and I'd take the weight loss any day.
However, given the choice I would purchase the Prowires. Much lighter, just as strong, and with some extra length (and much longer length options!) that really can help with rope drag on those longer trad routes. Unless you're exclusively climbing sport I'd definitely recommend getting a trad pack of these.
Pros: Light, cheap, long sling options.
Cons: None really. As with all wiregate draws the lock on the nose can sometimes catch when you're trying to unclip it from gear but this is a universal wiregate issue problem until you get to DMM Shields or Wild Country Heliums. Overall, they're a good buy.