Ive bought quite a few MVS carts and assorted PCB's from Bill over the last few years and he always treated me very good.
He has always gotten back to me fairly quickly email wise, I think people "buyers" forget that for some people ebay is a side business and therefore they dont sit and watch it constantly when selling and they arent always around to do so.
His stuff is very used and always needs a good cleaning ,but you will get exactly what was listed , give himatry if he has what you want. Its interesting that Mike at M.D. is pretty slow with email as well ,but we have to remember that they are busy in the real world as operators ,at least Bill is anyway.