This was a solid, effective Blu-ray player, with some useful features for those who want the best video quality. It played all the usual discs well, and for the bulk of Blu-ray discs (those with 1080p24 video, or in 3D) the picture quality results were the same as any other decent player. Where it offered particular advantages was with interlaced discs.
A lot of players are imperfect at converting 576i50 and 1080i50 signals (from DVDs and Blu-ray discs, respectively) into high quality progressive scan signals. Those signals are foreign, after all, to most Blu-ray player engineers, who tend to be in Korea or Japan or the United States. This unit did an extremely good job of it with 1080i50, not tripping up at all on any of my most difficult test clips. With 576i50 it was reasonably good, getting a touch confused at several places on the most difficult clip. Most discs it should work with perfectly.
But here's the thing: you can set the player's output resolution to Source Direct. That is, it will switch its output resolution to match that of the signal it is playing. If you have a home theatre receiver with better progressive scan conversion, or a display that can do a better job, just select that output setting and have the external device do the work. If, that is, your display has 576i50 specified in its HDMI Extended Display Identification Data block. Not all displays do, even though they usually do support that signal standard. In that case you can change manually to 576i50 output. With DVDs you can actually change the resolution on the fly using a key on the remote. Blu-ray discs you have to stop.
The discs loaded fairly quickly. You can search for specific times and there are five fast forwards and reverse speeds. There are also three slow motion speeds and frame stepping, but these two are only in the forwards direction.
Network-wise, aside from the BD-Live extensions on the occasional disc, it's limited to playing a limited range of media from DLNA servers on your network. You probably won't want to use it too much, especially for music. It supports only basic formats like MP3, WMA and WAV. It will also show JPEG photos and play MPEG format video.
The USB socket supports similar media. However if you're using some advanced Blu-ray features, particularly BD-Live, you'll probably want to leave a 1GB or more USB stick in the USB socket to act as the 'Persistent Storage' sometimes required for those functions.
This player is the kind that goes best with a high quality system consisting largely of other Onkyo products. You're paying premium price, not so much for a large feature set, as for quality construction and very good quality video output.