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Full user review
"Good, Fast Browser"
It's fast, dare I say faster than Chrome. Plus it just looks good overall. Also: Tab management tools such as tab recovery via the trash can icon.
It doesn't have a particularly extensive extension library; there's some good ones in there, like NoAds or NotScripts, but ultimately there's just not all that much there. Most of them are re-releases for other languages (e.g. Cyrillic). The same, possibly moreso, applies to themes, where there just isn't that many.
Opera is a nice little browser, with plenty of features to keep plenty of people satisfied (mail, feed reader, bittorrent client, and more), but because the market share isn't there the extensions aren't, either. Granted, if you don't use them much, that's fine, but personally I do. It's why, ultimately, my browser of choice is Firefox, but this browser is a great alternative.