I made the mistake of uprading my Sony Ericsson 18 months ago to a Nokia n95. Worst thing I ever did. I'm now back with a Sony c905 (on o2 tho)
Don't get me wrong, Nokia are good but Sony seem to have better battery life than Nokias' (Although c905 is still new and getting battery to full capacity)
Also I had more phone freezes with the n95 and had it replaced 3 times.
Never had a problem with a SE.