As of May 2008 there were 2 upgrades for the 4000D and talk of another. Honestly the quilting upgrade is the only one worth the price. It is worth it for the feet you get and the corner turn function. The other upgrade is not worth the money, imho. I think I have a box of that upgrade left. It has been opened. I will check for it and if you want it I will sell it to you for wholesale. (wholesale is 1/2 of srp) I may have to go to my mother's to look for it as I ran out of room at my house to store everything I have left. I also have some Brother feet, if anyone is interested. Before buying anything Brother check with me and I will see if I have it. I had 20 machines that I donated to the local High School. They were all sewing only machines and no one wanted to buy them because they were more that the inexpensive ones in the big box stores. I could take them off of my income tax and get more money then pricing them below wholesale and selling them.