I decided to wait till the dust settled down and 2.0 was well and truly available via getfirefox.com before downloading it. I had tried the release candidates, but didn't feel like abandoning 1.5.
There seems to be an issue with installing 2.0 over an existing 1.5 installation, i.e. an upgrade; updating my extensions or installing new ones failed with the 'installLocation has no properties" error. I ended up starting with a clean slate and downloading all my extensions -- ahem, add-ons -- again.
Anyway, 2.0 is way faster than 1.5, which alone is worth the cost of upgrading. Also, the spell check feature -- dotted red lines below misspelled words a la Microsoft Word -- is really really nifty. Makes posting to the blog a breeze.
Oops. When I click on the 'Check Spelling' button provided by Blogger (yeah, I'm like that), nothing happens. The error console says 'spellcheck is not a function'. Oh well.