The 3MM is heavier and not as powerful. It's upsides are that it is smoother because it has 3 bearings. Decent engine, but down on power.

All of these cheap engines have their issues.. the DL's issues just show up down the road. I know of a couple that blew up after 25 gallons. Most people don't fly that many gallons in a hurry so it takes awhile for problems to surface. Personally I have around 55 gallons on my Brillelli 60 without any play or issues... you pay more but its well worth it in the long run.