Yes, they all work. I just use the 99 the most. It has wonderful stitches!! I loaned my brother's girlfriend one of my Brother machines so she could learn. I have picture posted on here. The Singers are actually my Mom and Dad's machines but they have had them move in with me. ;) They knew I was so excited when I found out they had them. They were like-you can use then and if anything was to ever happen to us they become yours. I was so tickled!!!
http://www.quiltingboard.com/t-121268-1.htm I have the 1st one and the 3rd one here with me. The 2nd one my Mom just loves-it's in a cabinet.
My Kenmore is further down on this page.....(not the first machine you see but the 2nd one)
http://www.quiltingboard.com/t-125822-1.htm This one will run but I've not had time to do anything with her. I actually would be willing to sell it if someone was interested. I just don't have room for this many machines. LOL