My FF2 takes about 5 seconds to load up, once you tweak it a little you can speed it up and then you can move onto the wealth of fantastic add-ons that make surfin so much easier.........

For me Firefox isn't buggy, I've never had any problems with it.
Even if there was a site that wouldn't work in FF (rare nowadays) then all you do is install the IE tab add-on which renders the page using IE but in the firefox browser.

Only thing could be a slight memory leak with Firefox but I'm sure that'll be fixed soon enough. My pc runs on 2 gigs of ram so it doesn't effect me really.

TGB mentioned about the session manager in FF2 being a built in feature, well it was always an available add-on in Firefox 1.5 so you can always revert to 1.5 and get that.
Although I see most add-ons are heading towards being made for FF2 and onwards.

In short, I love Firefox dance: