I am strongly considering going the same way. My MBP is my second mac I have purchased. First was a PowerBook G4 1.67Ghz. Whilst the spec has been very good, the same can not be said the quality of the hardware or the software isn't as high as it used to be.
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I have been using Apple products for most of my life (mainly through school and work). Apple used to be renowned for quality software releases. Lately it seems there are almost as many updates as Windows. Hardware wise, my first PB developed a fault with the DVD drive just after the warranty finished. Installing Tiger on the MBP took four days with various hardware errors and the Superdrive made a chainsaw type noise (does every time I insert the Tiger DVD). A straight install of Leopard was impossible, having to install Tiger first (even though I bought a retail copy of Leopard). The day before yesterday, my OSX install failed. I could log into Windows but not OSX. With the last rebuilt, I stopped storing anything on the local hard drive so thankfully I didn't lose anything this time.
Normally I would not care about such issues but the fact that the MBP cost £1400 (including AppleCare) leads to me have higher expectations than I would of a Windows laptop that costs a third of the price.
On top of that I don't believe I get much more value out of my mac than I would out of Vista. Both can send emails, browse the web, edit photos, etc. Both are patched every week (this is more of a recent thing with Apple) and lately Apple has had a tendency to release updates that breaks things e.g. 10.5.6 broke Mail and bluetooth teethering. With Bootcamp configured, I am finding myself use Vista more and more. It just works for *me* more easily. Copying files between devices or other computers doesn't take forever and a day under Vista yet it does in OSX.
It hasn't been all bad. The firewall on OSX works great and there are some software features I will miss but nothing that I couldn't do under Windows.
Have a HP mini-note on order and come the summer, I will probably sell my MBP in the back to school rush and buy a Windows desktop to complement the mini-note.
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It's a shame really as I wanted to be a repeat customer for Apple. Have a Airport Extreme (and recommended it to others until Apple decided to stop support Time Machine backups of AE attached drives) and iPod nano in addition to the MBP. Once the MBP goes, the AE is going as well. So Apple, come July is bye bye from me.
Will probably have to change my nick after I sell the MBP
