One reason that I haven't switched to Android in the past is that it has seemed sluggish when I've tried phones that run it. I see that Google claims performance improvements of 4x to 5x over previous versions, but those numbers are based on benchmarks, not on real-world use.
Does anyone have any information about how Android 2.2 affects typical smartphone usage. Not just making calls -- scrolling through a long contact list, reading emails, browsing the web, navigating photo albums, playing games? Ideally, a side-by-side comparison of device X running 2.2 and an earlier version.