I bought one in the early 2000's, should be getting about 10% on it. The trouble with these is that the fixed rate has been 0% for some time now. If inflation does go down you could end up with a very low yielding bond. I forget what exactly it equates to on a yearly interest basis but series E bonds don't really pay squat until they hit the 20 year mark, at which time they are guaranteed to double. I wish when I was younger I had put the max into those each year I was able to, that's a nice little "pension" when you are older.