When the complaints about possible bugs diminishes to near nothing
MyDefrag is very stable already. There are still some bugs, but please note that MyDefrag pops-up a window asking for people to post their logfiles here on the forum. So the number of reports here on the forum is relatively high. This may give the impression that MyDefrag is not stable, when it is actually very stable for the vast majority of users. Far more interesting in this respect is the number of postings by people that have a question but are otherwise happy. Also note that commercial companies do not publicize the number of complaints they get. I would not be surprised if MyDefrag is actually more stable than most of my (commercial) competitors, but I have no way of proving that.