I just bought a new Brother machine this year from a dealer. I go back to that dealer often to by thread because I get a discount on everything else in the store since I purchased a machine. Anyway while talking to the dealer a couple of weeks go she warned me harshly not to sew over the pins, alot of the new models can short out if you jam a pin in them. Now I've been sewing for years and its a habit to sew over them, thats how every sewing teacher I had taught. But with the fear of shorting out my machine, in the last few weeks I've been taking the pins out just as I get to them. Not a hard habit to break when you talk about hundreds of dollars to fix. Warranty doesn't cover it if they find a pin jammed in there somewhere. Sometimes I think all these bells and whistles arent worth the hassle.