I really don't think it matters Captain John. You "pays your money and takes your chances". All the engines from China are a "crap shoot" as far as I'm concerned. At least DLE seems to try to support their product, and that's probably the only reason Tower Hobbies took them on. For most of my stuff, I'll stick with high quality Japanese hardware and use my "Conversion Engines." The Japanese basically "wrote the book" on high performance two strokes, and their quality can't be beat. If you just have to have a purpose built R/C engine, then pay the bucks and go OS. Of course, we don't know where all the parts are really made, but DA has an excellent support record too. Lastly, because of their great support, I wouldn't be afraid to buy from Valley View R/C.