
Impressed
Got to play around with 10.5 yesterday and was very impressed, not only has the javascript engine improved the whole user experience seems faster, the only thing holding up page load was my crap DSL.
Opera has released "labs" builds previously with features that are absent from this and production builds, such as HTML5 video and the W3C GeoLocation API. Video was removed from this build at the last mintue due the developer responsible being on holiday.
Opera 10.5 looks very promising.