I had to workaround a bug on a Samsung Galaxy S recently. You can't sync the phone with an Exchange calendar without first having created a google calendar on the device. This is with the latest firmware (which by other accounts seems to have fixed some of the other issues with the device). Hence, on this device I would say my experiences are "the use of the device is great, but configuring it is a PITA".
iPhone 4 - marvellous UI, bit pricey though, and evangelised about by morons in black rollnecks.
Torch - don't know anyone with one
