It's okay.  I had to hammer on it to get it to release the spent part of the rivet for every rivet it put in, which was a pain but it did do the job.  I suspect it either needs an adjustment or else lubrication in the jaws that grip the rivet.  I don't foresee it as a tool I'll use a lot, so since it did the job I bought it for, it's not too bad.