UPDATE: 20 Oct 2008 - have spent some time playing with both handsets, and even more time looking at Windows Mobile as a whole. Since I travel a lot, and will not be buying a handset as part of a plan or contract, I'll be buying an unlocked, full retail price device - and have decided to wait a little longer before taking the plunge.
I like Windows Vista - it's a cool and stable OS. But it's taken me a while to get it to boot fast, and stop thrashing my disks to death. Windows Search, automatically scheduled items like Disk Defragmenter and Windows Defender and the biggest culprit - Superfetch, all put a heavy load on boot time and run time disk activity.
I remember the first time I was burgled. It was in 1993 and I was living in London at the time. It was a tad unsettling to come home and see the front door of my apartment smashed open, and things not exactly the way I left them before I went to work! I lost a bunch of Audio CDs, my TV and some cash that was lying around - but NOT my computer.