I put Windows 7 Home Premium on my Macbook the day Win7 was released, via Parallels 4/5.  

For the most part it's been a reasonable OS, though it hasn't exactly made me think it's better than OS X or Linux.  The one thing that has made me grumpy is that the boot screen no longer shows the new Windows animation coming towards me.  Instead, I'm seeing Vista's green progress bar.  That's, what, merely a few weeks of use?

Some quick searching via Google shows I am not alone.  This seems to be a common experience for users of Windows 7.  The causes seem be something to do with the locales and there is a fix  for it.  If you use an elevated command prompt with Administrator rights, you simply use bcdedit or bcdboot.

I tried that and got my favored boot screen back for just one time.

Admittedly, this is a really small thing that hasn't greatly impacted on my use of Windows 7.  It's just plain irritating as I never used Vista and can't see the sense in this happening.  It just makes me wonder if, a few months down the line, something else will revert unexpectedly.

While it was good having a WIndows here on the Macbook, it really needs to stand out.  The competition is now nipping at Microsoft's heels and in some cases surpassing it, so stupid things such as this bootup glitch are going to have a greater impact.  Less users will tolerate things that detract from their productivity and computing enjoyment.  After all, who wants to spend an hour or two searching the net for an answer that only works for one restart.  If we want to do that, Linux gives us greater control and satisfaction for the same amount of work.