I got this by email and it just made my evening:

“Just wanted to let you know your SetUUID tool was very appreciated.  I had the same situation as you (VHD on a separate drive from the snapshot) and had a very hard time finding what the issue was.  Finally stumbled across your post this morning and it did exactly what I needed it to do.”

It’s such a good feeling to know that something you’ve made has helped someone fix a problem.