Man.. not really a good one i would say. I understand you need the keyboard but a colleague of mine owns Xperia Mini Pro and the battery life is pathetic from what he tells me, I did a quick Google about it an that's what everyone's saying. 1200 mAh is a little too less for a 3.0 inch touch screen device with ICS (in a couple days).
And, I come from a Nokia E63 background, I too was afraid to jump into the touch screen wagon. But when I finally did, it wasn't that bad after all. Especially with that swipe-to-type gesture thing on Sony's (or maybe its standard android, not sure), I type faster than my old E63 mostly, and it gets better with time. The more words you type, the more it learns, and the more you can swipe-to-type.