I have used it and it does hold pretty well. Keep in mind though for a few things. Can your part take the heat to activate or release the part? The temp required isn't extreme but if you're doing some thin wall stuff, the part may move.
Another thing is don't "stand up" the part a long ways from the surface thats being used to clamp it. You can't be that aggressive since your part is now "flapping in the wind" so to speak.
And be sure the base (or the "fixture) is plenty thick so it won't move from the heating. That way you'll ensure a "repeatable" set up and consistent parts as you go through the motions.