I happen to love my MDS engines, I wish they were still in production.. I own probably half a dozen of them at the moment ranging from 40 size to 60 size. I've never had a major problem with any of them. in fact I recently purchased a .40 for around 12 dollars on Ebay that had been involved in a crash and had a cracked case near the carburetor.. I basically bought some permatex black and sealed it, and it has absolutely 0 problems running.. Don't get me wrong, I love my OS engines and Saito engines as well ... But MDS has treated me equally as well ...Now dont get me started on Magnums... Now those are Garbage !!