Compared to Chrom(e|ium), I don’t get crashes on every other website, a decent release cycle, a decent repository and, you know, a browser that does what I want rather than forcing me to want what it does. Oh, and a functional speed dial.

Compared to Firefox, it actually makes decent use of RAM, doesn’t require fifty-five trillions of addons to work remotely properly (and hence doesn’t require updating of said fifty-five trillions of addons every other day) and a decent release cycle.

Oh, it also works on my phone and I just had to copy over wand.dat to get all my passwords there as well :-)

I wouldn't say they're all that terribly behind. I use Opera daily and rarely have issues with websites. The last really big issue I remember was the Twitter fiasco when they found out Presto wasn't prepared for a Javascript file that was larger than average and only had a single statement because replacing semicolons with commas became the cool thing to do.