The main thing I worry about when it comes to cheap aftermarket parts is material quality. I wonder what alloys are being used, and how high the quality of the raw materials was when they made the parts.
I'd never managed to break a pair of standard pliers just by squeezing them with my hand, until I bought one from Harbor Freight. It snapped like a dry twig, and I wasn't even in Hulk mode at the time.
After that of course there's issues of fit and finish and the engineering (if any) that actually went into the design.
On the other hand, sometimes a clamp is just a clamp, and i do tend to worry too much about things.
![Grin ;D](http://forums.sohc4.net/Smileys/default/grin.gif)
mystic_1