I've never install a disk repair app...and never have needed to. If I did, however, I wouldn't chance it with an unfinished buggy version of something that has the ability to wipe your HD clean in seconds.
I have a whole pile I use: Cocktail, Macjanitor, Maintain, Moo, Mox Optimize 2.0.2, spring cleaning 3.5.1 and drive 10. I am not sure if any of them make significant improvements but I still use them time to time.
Hey, it's your poll, write it anyway you want. It's not like you're Decima Research and writing the poll so that the results are predetermined.
Your poll was written in such a way that there was no option for me (the right way). All that means is there was no second- or third-best answer available to put me in a camp I don't really belong to. A Good Thing.
As far as DW and OSX goes, as long as my machine boots OS9 it's a non-issue to me (and it will be quite a while before my QuickSilver gets replaced). Run the utility from the bootable CD; it works on OSX volumes just fine. For those with OSX-only machines, DW for OSX is probably about a month away from release.
Norton is allright, although they have put out a few flaky versions in the past. Similar story with Drive10; it was released a bit early but apparently now is OK (from what I've heard).
I like DW because it has fixed problems the others could not, it's oh-so-simple to use, and Alsoft has never released a product that was not rock-solid. DiskWarrior (OS8.1) is at version 2.1; PlusOptimizer is at version 1.3. Think about that for a moment ... they run on hardware as old as 68020 (DW)/68040 (PO)/System 7 yet don't break if you run the latest hardware/software. To me, that's good engineering.
I have never had either of them break anything (or even heard of it happening to anybody), something I can't say for Norton or Drive10.