I used to use Opera as my primary browser for a short while, but went back to FF after running into a couple of hiccups.. like bank login problems etc.
Ive just upgraded mine to the latest version, and had a go at turbo mode. Dont like it as the images become very poor and blocky - and some of them awful. This sort of compression is primarily used to assist those on dial-up (eg OnSpeed).
Speed Dial
One of the things that I really did like about Opera was their SpeedDial which must be a couple of years old now?
Firefox has an equivalent plug in though which Ive been using for a few months -
linky. The only annoying thing about the FF plugin that Ive found is that after a FF update - it seems to forget about them and you have to reset it to your home page.