Slow, particularly with multiple tabs. I don't use it. I use MicroB and Opera Mobile (although this can slow down something nasty too if you have too many tabs). And I use mobile sites when I can (see the "Useful URLs" wiki page in my sig).

Slow. I generally avoid this.

The bottom line is that I've used my N810 daily for the past three+ years. But I've carved out a specific niche of what I do with it, and that includes:

• Accessing mobile websites or non-mobile websites if they are simple
• Podcasts (gPodder + Panucci)
• MaemoMapper
• MP3s (MediaBox, Quasar)
• Remote Desktop
• AbiWord & Gnumeric (although you do have Easy Debian for OO.org as well)
• Taking notes with Maemopad+
• DialCentral for Google Voice (mostly text messages)
• Evince for small PDFs. Too many pages & too many graphics and it's too slow for me.
• Lots of little games for the spare minutes here and there, like AisleRiot Solitaire, Tomiku (Sudoku), Sokoban, Anagramarama (anagram game), Mahjong

To see the available apps, go to Downloads on this site and press "OS2008", or go to:
http://maemo.org/downloads/OS2008/

Other tips:

• There is no extras-testing repository.
• No MeeGo and no graphics acceleration. Stskeeps gave up on that one, I think (I don't blame him).
• There is a community SSU. The best feature is rotation support.
• Telescope is a really neat app switcher.
• Check out the Diablo Turbo thread.