Yes, I have used the hack and judging from this forum and others, so have a lot of people. I don't have the International version. I only had one problem. I used the hack before 2.3 came out. I knew that the update wouldn't work with the hack so I wasn't going to bother with the update. But Amazon kept trying to push the update to my Kindle. That would cause my Kindle to reboot when the update failed. That was annoying so I removed the hack, got the update and then put the hack back on.
It was all fairly easy and I like having my own personal screen savers.