I know they sell engines on ebay, and i have seen various negative complaints on the them on other web sites. It basically comes down to how many test engines could there possibly be. Most test engines also are pushed to the limits in attempts to get them to break. Is a box of chocolates really a consilation prize if you have to yank it out and replace it? For the cost of one of thier "new" engines you can come close to a reman with a new AM general block, mahle pistons and get a 12month/ 12k mile warrenty. For around 5k you can get a new goodwrench 6.5 with a 3 year/ 36k mile engine. Tough call but i wouldnt want to replace and engine and have it fail and replace it with another one of questionable background.