Jason all the Videos on YouTube said they are fussy, and they are. But once you get them "tuned" they seem to work fine. Three biggest problems I had were figuring out Needle and Thread sizing, how to get Bobbin to work (install it). You have to clean it real good then oil and grease it up. I polished the bobbin holders too. Sanded a lot of the rough edges and fixed some shoddy work. Sounds like a lot of work but its more frustrating! Once you get it all squared away it really runs good. Mine is running well now but I need to tweak the stich length, shouldn't be that big a deal though? You could go nuts I suppose tear it down clean and polish everything paint it etc... I just wanted it to work! Oh and it sewed the 2 layers of 8-9 ounce leather no problem