I've just finished testing it and (knock wood) it works exactly as advertised. Diskette and permanent installations have not caused any problems on my test machine so far. (Boy does it feel weird quoting myself! )
I'll still need to see if various defrag and other disk tune-up utilities I have will break it.
Looks like a winner. I have experienced NO problems running a WinXP/Linux setup with Boot-us.
As expected, all the Windows utilities I've tried ignore the non-NTFS partitions, so there is no risk of inadvertently hosing your NIX installation.
BTW: Boot-us may cause your antivirus utility to warn you about changes being made to your boot sector or MBR. This is normal and can be ignored.
Boot-us can also be easily removed with Windows' own fixmbr
command if you experience problems or decide you don't like it.
Overall, I'm happy with it. It works, and for Windows users, it's appearance presents a lot less "culture shock" compared to grub
IMHO - It's a keeper.