I've bought quite a few parts from them for my buddies 440 bulid (see another thread). I've delt with a guy named Brandon every time. Nice people, don't have the attitude that some smaller automotive places seem to. On parts not packaged by them, they have a no return if opened policy (good & bad, I mean i'd perfer to buy parts from a place that has that policy, but it was annoying when I forgot to check the new timing chain gear against the camshaft before cutting the clear packaging open. Gear was a 3 bolt, cam is a single. It was my stupidity in the first place when I ordered the parts (from them & summit), so it wasn't 440source's fault). We'll have no problem unloading the Timing chain & gear on ebay, but still. All I'm saying is check the parts first.
When THEY send you the wrong part though, they are very accomodating to make it right. I ordered 2 rocker shafts from them. One of them was definetly the wrong part, WAY to short. Sent them pictures, & they handled it as I felt they should. They sent me the new one & paid to return the part. I'm still a customer of theirs. I plan on buying from them when its my turn to assemble the block sitting in my garage. So there is the bigger points of my experience with them. anything specific you want to know. oh yeah, only phone orders. I found that a bit annoying, but oh well.