....mostly just order takers, with a few exceptions IME. Not the ideal place to do research or have important questions answered about the products they sell. Stick to the internet for such research.
That said, Bob's product looks to be what you need *if* you required a way to bridge a blu ray player which had an ethernet port in back (most do, btw). Otherwise, I would see no benefit from a bridge since you can avoid having another device in the middle of the wireless path. FWIW, I have used/installed these when the distance from wireless router to media center was too far to make it practical to utilize a simple but 100% reliable ethernet cable. The benefit of going strictly wired is increased speed too, besides having more of an 'instant on' connection when running apps from the BD player, etc.
More importantly though, I'm not aware of any newer Blu ray players that actually support 5GHz. And buying a 2011 Panasonic might not be wise since they often have issues playing back discs, lack of firmware updates that can affect performance/functionality/etc. Solved one problem but created another potentially. YMMV. Going with a cheap wireless bridge + a good <$100 BD player with simple but effective ethernet port might be a better choice to stay up to date with your player.
FWIW, The only older model I saw still for sale which supports 2.4/5GHz-
Panasonic DMP-BDT210
http://service.us.panasonic.com/OPERMANPDF/DMPBDT210-MUL.PDF
*see p.36 & p.39
http://www.amazon.com/Panasonic-DMP-BDT210-Integrated-Wi-Fi-Blu-ray-Player/dp/B004G8HXXO/ref=cm_cd_ql_qh_dp_t
Let us know if you have any more 'how to' questions.
cheers