Yes, I do have a P900. Despite my rather lukewarm review of it a few months ago, I’ve really warmed up to it. I doubt I’d upgrade to a P910. I don’t use the flip, I rarely get out-of-memory errors (I use sman to close programs I’m not using), I’m still using the 32-MB MSD the phone came with and all the BT profiles I need, the P900 has - so I wouldn’t benefit from upgrading.
I’m always looking for the next thing, so I’ve been taking a hard look at the Motorola Mpx220 and the T-Mobile SDA. If I do go that route, I’ll miss the stylus. :|