Just got my 555es a few hours ago. I replaced a 775 with this beast and so far am extremely happy. I've only had it about 4 hours, but here are my thoughts. Here are my inital impressions about unimportant things: [*]Build quality is impressive. The extra weight is noticable.[*]I like the style of this unit better than the 775. It feels more like a high end player.[*]Gold RCA connectors are nice.[*]Included two SACDS: Sony Sampler and a Choir type CD which I haven't looked at yet.[/list]In terms of sound quality: [*]It is much more detailed than the 775. You can feel the pick on the guitar strings. Cymbols are amazing.[*]Bigger sound stage. Can feel the "air" around the vocalists.[/list]Overall, I'm pretty happy. I paid an extra $400 bucks to upgrade from the 775 and feel that the trade was worthwhile. I will post more when I get some time to listen more closely. *MODS* Just noticed that I titled this 775 vs 55es SACD players. It should be 555es. Thanks for changing it.