Hi Hattie, I just bought the pfaff 4.0 on Saturday and am waiting for it to come in as my local quilt shop had to order it. And I have heard good and bad reviews on this particular model, but the owner of the shop told me that all of those "tension" problems have been ironed out and she has had absolutely no problems with the new ones. Talked to a person in the shop that day that bought one 3 months ago and she also has had no problems and loves her machine. I am hoping all goes well with my new purchase as it looks like an awesome machine.