This weekend I picked up a BDP-320 and in short, I couldn't be happier. This is the first blu-ray player that I've owned and I'm now really sold on the format and the player. My initial concern was that my non full HD plasma would not provide me with much of a picture improvement over the upscaled DVD picture of my Denon DVD Player. However after plugging in the BDP-320 and firing up Casino Royale (which I already thought was near HD quality on the upscalled DVD) I was very pleasantly surprised by the quality of the picture. It was a huge step up from the DVD I had been using, with the extra detail of the blu-ray immediately obvious. One area that I was surprised to see a big difference with was the colour. The colours from the blu-ray were both, more natural and more vivid (where appropriate). The sound also surprised me, with the extra resolution of the HD formats being quite apparent simply from the roaring Lion in the MGM logo. Valkyrie was particularly impressive, with the sound of the propellers in the aircraft sounding powerful and detailed in a way that I havn't heard from DVD. In comparison the DVD sounded like it had been smoothed over. Vocals and instruments also sounded fuller and more natural. As with the picture, there was an area of improvement that I was not expecting...the bass. I'm using the same amp / speaker and sub that I had before I used the 320, yet somehow the bass seemed deeper, more powerful and definitely better defined.
DVD was also very good and seemed a good match for the Denon player I was replacing. The pioneer probably had the edge when it came to darker scenes, although I did not a-b compare the two.
Any problems? Well yes. Firstly the machine froze the first time I put a disk in it...it wouldn't eject or even power off, so I had to pull the power cable which resolved the issue (I have a replacement on order). The second, is that the mechanical noise from the player is definitely louder than my Denon and can be quite noticeable in quiet scenes during the film (although it is not terrible). Thirdly, the player does not output bluray at 720p, instead choosing to opt for the arguably inferior 1080i - I have mentioned this as a negative, however in actual reality the picture is stunning so I don't think I have anything to complain about. And finally, slow panning shots (while acceptable) are not as well handled as when the player is playing a DVD. I have heard that this happens on a lot of blu-ray players if not outputting the native 1080P signal...I'm not sure if there is any truth in this.
Please take the negatives in context though...none of the issues are that big and the player performs so well that I can easily forgive it. The player was a BIG sonic and visual upgrade and worth every penny.
EDIT: I did not measure the loading times, however the three films I have tried so far took longer than a DVD to load, but didn't take long enough to be an issue.