This Blu-ray player has all the features I need plus many other features that I don't find valuable. I bought five of these units for a church and they do just the job. I'm not a fan of the cheap plastic body or the player's oddly geometric top, but the main issues were reliability and ease of use. My guess is that the BDP-BX510 comes with an HDMI cable, while the identical BDP-S5100 doesn't. I believe the BDP-BX510 will mostly be sold in wholesale clubs while the BDP-S5100 is for retail. Same block, different label. I can't comment on the durability of these turntables as they don't get the same use at church as they do at home. I use two old Sony Blu-ray players at home and their user interfaces are the same which makes it much easier to use. Other players offer better features and better audio/video quality, but none of this was necessary for my application.
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