No horror story, but I was also VERY skeptical. I had Steve watching for an engine for me and he called a couple months after we initially talked and had one of those "too good to be true" engines. Engine had a very recent OH and on request he faxed me copies of the log pages and info about the shop that did the overhaul. I called the shop and got copies of the OH invoices. I sent them a deposit and drove up there to actually see it for myself (always a skeptic). Engine was exactly as described, so I gave him a check for the balance and took the engine home. Fortunately I didn't have to test out their guarantee on the engine but have talked with people that did and they have all been satisfied.
I don't have any affiliation with them, just a very happy and satisfied customer. I will say that I called them a year ago about a new flywheel with a different pulley size and there were absolutely not competitive on that!
Bob RV-10 #40105