Opera is the best of both worlds.
We have a lot of snapshots to check the latest improvements and the users who need stable versions had 11.51, .52, 11.60, .61, .62 full of fixes up until now while waiting for 12.
But IE is VERY important in business, it can’t have room for fails.
A fail could affect a lot of users and imagine in enterprises how it’d harm. Also it’s aways shipped with the next Windows version, which is very important to be as bug-free as it can be for the same reason.
(However it doesn’t prevents IE of being a sh*t! lol – seriously, IE 9 keeps crashing some sites people use where I work and give that message to recover the tab that crashed. It isn’t understandable as no other browser does that in these situations [except Chrome would perhaps])…