Sony Ericsson Xperia X10 Mini Pro
Keyboard gives the edge?
You're not likely to be watching much video on the small screen, and if you do, it'll look reasonably sharp, but very, very small, with no option to expand letterbox format films to fit the screen's dimensions. The music player fares better, though the sound of MP3 and AAC files was distinctly bass-light through the supplied headphones. The auto-tuning FM radio worked well though.
The keys are easy enough to distinguish under the thumbs
Browsing is hampered by the small screen dimensions and the lack of a zoom function, but there are HSDPA 3G or Wi-Fi connections for speed and you can view multiple pages. There's a magnifying window to help you pan around the page.
The X10 Mini Pro runs Android 1.6, but with a few tweaks from Sony Ericsson. There are four home pages, each of which can be furnished with a single widget, such as time/date, Timescape, search, calendar etc.
On my sample there also appeared to be a bit of a glitch in the calling software: usually when I made a call the screen would change, giving me an option to end the call. Sometimes, though, it remained on the keypad screen, which doesn't have an option to cut the call, leaving calls to voice messages hanging with no way to end them.
Unlike the X10 Mini, the Pro model has a removable battery under its backplate
Call quality incidentally seemed a little on the quiet side, though it's clear enough.