I was testing my 301 and sewed through 12 layers of cotton with no problem. I just wanted to see what it could do. Kind of like seeing how fast your new hot rod car would go I suppose. I have been researching the different topics on FMQ though. I am reading about some of the same problems mine is giving me. Other that the FMQ, the 301's are GREAT. All metal gears, no belts, that is why you get such good piercing power. I actually own 2 of them...and would probably buy another if the price was right. The first one was at Goodwill for $50.00, and the second was at a garage sale for $25, both included a buttonholer. If you are near a city, check Craigslist. I have seen quite a few come up there at all price ranges.