Hope you get many good years out of them! One of these days I'm gonna lay out the cake for an interchangeable set, but just at this moment that's not in the budget.
One word of caution that I've heard from people who use the "click on" type interchangeables (including Addi) is that they can sometimes come uncoupled without warning. Since I've never used anything but the screw on type, I can't confirm or deny. Just passing on what I've heard so you can look out for it. Could be just a few people having "meatware" issues.