I have been quite pleased with the s390. Granted I came from a Toshiba BDX2000, so the bar was set quite low and really would not be a fair matchup. Needless to say, this thing loads blu-rays up to 3x faster than my older player, but your mileage would vary based upon your prior unit.
I enjoy the size of the s390; it is small and fits well into any decent size space.
I am indifferent to the design of the player, but I cannot really even notice it once it was tucked away into my center. I did not like the use of plastic, and would gladly pay $20 more for a high quality metal casing, but I know most shop by price these days.
One item I have noticed is that the player takes awhile to shut down after powering it down via remote. This process takes about 5-15 seconds on average, whereas my older player turned off within a second or two. This may be related to the fast boot feature, but not sure.
My experience with Amazon VOD has been quite pleasant, but this would be my first foray into VOD. I actually feel the Amazon VOD speed is rather good, and never find myself irritated, but of course there is always room for improvement. Areas that could use improvement on speed would be the pop-up menu whilst watching content. Sometimes this lags by a few seconds. I would also like to see only 1 instance of the approximately 10 second process of checking internet speed before playing content, as opposed to it occurring for every piece you watch. That said, I might be ignorant to the reason for this feature, but it seems redundant to check your speed 30 seconds after loading a different piece of content.
I like the Amazon VOD UI for its simplicity, but searching/sorting could be improved. You can drill down by movie or show, and then by genre, but it seems like having an ability to sort via additional metrics such as an alphabetical list would surely be nice.
I have only had two errors thus far, but they were random in nature and have not reoccurred. I am hesitant to elaborate for fear of worrying others. Without much detail, I will say I had an immensely abnormal shut-down speed one time, and a disc fail to load anything after being inserted which required a pulled power cord. I will report more if they occur again.
Overall I am very pleased. I fully intend to keep this player unless I get any reoccurring issues. I would feel fully confident recommending this player, particularly to those that want the maximum VOD features. This was the reason I chose the Sony over the Panasonic, and I feel it was the correct choice.