I have these in SAE and metric. They work great for what they are meant for, but I would prefer regular 6 or 12 point over these. I find they do grab bolt heads well, but my biggest gripe with them is that it takes quite a few degrees to engage the fastener. What this does is when your using the ratcheting end, you have probably a 10 degree angle that you have to pull the wrench back before the ratchet mechanism will start moving.
I'm not sure what other options are available for wrenches but I would suggest finding a 6 or 12 point.
ALSO, about 50% of my wrenches are HEAVILY curved, I talked to Gearwrench about it but it was a really strung out process to claim warranty so I just left it.