That sucks man.
I've gotta say, I bought a rebuilt unit from them also (a Getrag 5spd manual) and overall I was pretty unimpressed with the whole ordeal (but nothing as bad as what you're going through).
The clutch pivot pin was broken, has to swap that over from the old unit. Then, when I installed it, I found that the unit had a crack in it. Vines would only offer to ship a new one (after I shipped the old one back, which meant I had to pay to have the trans pulled again...)
I opted to let them offer me a discount on the cracked trans if I could patch it with some JB weld, which I did, but I think its starting to leak again. I found a spot on the garage this morning, and its grinded once or twice when going into 4th, so I think the oil may be low. I'll have to get back in there tonight and try to patch it up again.
Bottom line is, I agree, their "rebuilt" units are generally pretty poor quality. Definitely not something I would purchase unless dealing with them locally and had immediate turn around.