I wouldn't run ProComp. Low quality parts, gotta be saving money somewhere. Aside from the reported poor quality, I generally avoid buying Chinee junk when there is an American alternative. Especially with our economy in the crapper every bit helps. Also think of it this way, how much money will you save after you've had to replace the ProComp pump and waste your time if under warranty and possibly eventually buy a good quality pump to replace the slanty eyed engineering? My time and aggrivation alone is worth the difference in price, not to mention the money spent doing it right the second time around.
Beyond that, I've run a Japanese mechanical pump on a small block before. Bearings went and it started leaking in under a year of daily driving. I will confess I have one ProComp part on my truck (before I kne any better). It's a drop pitman arm. Seems comprable to reputable brands as far as size and weight, but then again it doesn't really move. If I ever get back into off roading seriously I may replace it just to be safe, last thing I need is a pitman arm breaking on the highway.