I'm thinking about swapping my current phone (Nokia 5800) for a Samsung i900 windows mobile, what do you think?

Any users of the i900? is it reliable/buggy/etc?

I've had one since last September, on T-mobile.
It's quite good, but would I buy one now, possibly not.
The stock ROM on the phones is pretty poor. Mine was slow, buggy as hell, and the battery never lasted a full 24 hours (with minimal use).

A few months back, I upgraded it to one of those custom ROMS, and the difference has been like night & day!
I now get 3-4 days of moderate use from it, it's really stable & touch sensitivity is greatly improved.

I use Memory Map on it alot which works really well.
The real problem with these phones nowadays is the underlying windows mobile o/s which is very dated.

http://www.modaco.com/category/342/i9x0-omnia-http-omnia-modaco-com/

http://www.samsung-omnia.org/

Both have been very useful sites for me.