I've always had a positive experience with everything I've purchased from 440 Source. But clearly, there are things they sell that I wouldn't even consider buying, regardless of the savings.

I picked up a used Innovators West balancer from a friend, because it was marked "BBC" at a swap meet, and then wouldn't fit on his 454. Gave him 100$, twenty years of flawless service.
Have one of those TCI "Rattlers"...darn thing welded itself to the snout of my 440 crank, tried everything to remove it, no luck.
I've got an SFI approved "PowerBond" on my stroker small block that has held up great the last 6 years.