Hammill,
I have had the ethernet cable set up with various blu-ray players for some time now and never once did I encounter any loss in the internet connection when carrying out a firmware update. I trail a cable from my bedroom where the router is, to my living room.
Anyone with a Profile 2 blu-ray player shouldn't have to burn cd's anymore - a thing of the past and a necessity with Profile 1 players unfortunately.
All it cost me was £5.00 for a really long lead and I have this set up permanently where my blu-ray player is sitting. A one time negligible cost for such a convenience (in the absence of Wi-Fi, which is even better!)
Also, with the S-370 in particular, there is so much more that is available - BBC i Player etc etc, so how would this be accessed without intenet connectivity?
Ronald