Unfortunately this excellent pant has beed discontinued by Patagonia and replaced by two new pants. The slightly lighter Patagonia Simple Guide Pant and the slightly heavier Alpine Guide Pant. While we haven't tested either of these new pants we think the Guide Pant would make the best replacement for the Rock Guide.
To read about the discontinued Rock Guide keep reading.
The Patagonia Rock Guide Pant is our Editors' Choice rock climbing pant. It has everything one can ask for in a three-season climbing pant; it is lightweight, climbs well, fits well, and has all the features you need with none that you don't. This pant thrives in the multi-pitch environment, where you'll really appreciate the zippered topo pocket, the feather-light weight, and the wind blocking, quick-dry fabric (if and when the weather turns ugly).
The lightweight fabric is not made for repeated offwidth or chimney use. For these types of high-impact climbing, I would recommend the Prana Axiom Jean, the burly Mountain Hardwear Piero, or even a pair of Cotton Canvas Carhartt or Arborwear pants. You don't have to baby this pant, however, and if a climb includes a few pitches of offwidth thrutching, I wouldn't think twice about using this pant.
It is the second lightest pant that we reviewed, second only to the Arc'teryx Rampart Pant, but much more durable. It doesn't breathe quite as well either, but the fit is much more appropriate for climbing, and the breathability was never a problem. If you are buying this pant for hiking rather than climbing, however, consider the Rampart Pant for sure.
At $79 retail, the Rock Guide Pant is only $9 more than the cheapest pant reviewed, the Prana Stretch Zion Pant, but they fits and climb significantly better. I actually find that the pant legs stay rolled better on the Rock Guide Pant than on the Stretch Zion Pant, even when using the roll up leg snaps.
One large downside of the Rock Guide Pant is the lack of different inseam lengths. Patagonia has really dropped the ball here, as all the other pants in the review made by other companies (Mountain Hardwear, Prana, and Arc'Teryx) have 3 different inseam lengths to choose from. If you have a hard to fit body type, you may want to consider looking at some of the other pants, or find a good tailor in your area.
The pant does not look as good around town as the Prana Axiom Jean, but looks as good as or better than the other competitors. You will look like a rock climber. That's not such a bad thing, is it?
The Rock Guide Pant will almost certainly become the best climbing pant you've ever owned. Use it, abuse it, and enjoy it!