First, it's important to clarify reversible (ie you flip a lever to reverse direction) vs the non-reversible (you turn the whole wrench around to reverse direction).
I've had bad experience with the reversible GearWrenches in both standard and metric. With very little use on them numerous sizes would bind up when using them, or reverse themselves. I kept replacing them at Napa, but the replacement kept having the same issue, or new sizes would spring up w the same issues. Off the top of my head the 8mm, 13mm, 1/2 and 9/16 were all replaced at least once, a couple of them twice. The 10mm is also suspect. I believe all the sizes are susceptible. The replacements always displayed the same results after a bit of use.
I did not over-torque these. I did not use a cheater. I did not use them to break frozen fasteners. I did not store them in a humid environment, allow them to rust, drop them in puddles, spray them with solvents, or anything else. They sat on my workbench in a relatively dry environment. They were only a couple weeks old when they started showing problems.
I DO NOT recommend the reversible Gearwrenches or any of the re-badged ones. I've now got the reversible SK's. Not enough use on the SK's to give a report. The Gearwrenches went in my truck tool bag where they sit behind the seat 363 days of the year I'd guess, they're too annoying to use on a regular basis.