Sony Ericsson W810

I'm confirmed Nokia user but my two Nokia's are going to die pretty soon - AT&T can't seem to replace with like kind (6126 is OK but no FM - N75 too "busy")sooooo am interested in SE810 'cause me and Motorola don't get along.

BUT .....

... Coming from Nokia is UI going to be too strange?
... Keypad - looks awfully small and hard to get used to. True or no ?
... Another forum keeps mentioning dropped Calls and how to mod in order to fix (too much work)
... Several reviews refer to volume issues and the need to load new drivers to fix (too much work)

... RF and Call quality are top req's
... FM & Music player are next
... Addr Book / Calendar