Well no problem even if ur fone has R1 or R2 u can update it via sony ericsson update service to R3 ! battery timings are amazing 8hrs talktime and 2 days standby but if u use wifi then it drains quickly !
My friend had touch pro we compared both and xperia x1 is far better ! it has better slide , bigger and high resolution screen , metal body , better battery time , panel interface n etc !