RE: AVOID THIS ENGINE AT ALL COST!!!!!
One man's trash is another man's treasure. I never did understand why folks have such bad luck with the same engines that I find perfectly fine - MDS, for example. I have several of each of the .68, .78 and 1.48 and have not come across one that didn't run smooth and powerful after a break-in session on the test bench. Then again, maybe that is the problem. Some folks expect an engine to fly right out of the box.
I have had Magnums, OS FPs, and Towers, too. Not all of them are perfectly smooth, but none that I would say AVOID THIS ENGINE AT ALL COST!!!!!