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I've never used Opera before. I snagged a key from the site and now I am a convert...seriously this browser rocks! Though, already I have seen a few rendering bugs, but no show-stoppers.
The browser seems really fast too...
If you spot problems with a site you can do everyone a favour and click HELP->REPORT A SITE PROBLEM.
Opera periodically checks to see if there are updated BrowserJS/UA.ini files which provide fixes for some sites identified as incorrectly identifying or handling Opera.
Handy tool that.