Well, I'll answer your questions in another opinion:

1. I use the calendar to remind me of things, works well for me, never tried syncing though, never had too!

2. I connect to MSN, Facebook Chat, and can be signed in all day. Integrates into your contacts and normal message, very seemless.

3. Never had to use the GPS yet, couldn't comment.

4. I find the phone intuitive and very easy to use. I'm no Linux geek either.

5. SMS works brilliantly. You can get an app for MMS. No idea why the other guy said SMS is bad! It works very well!