I've had my 55LM9600 for a few weeks now and overall am impressed. Solid picture quality, great looks, nice extras (I have an XBMC setup on my other TV, so I loaded PLEX onto my Diskstation server and can use MediaLink to watch shows on the LG). Not enthralled with the Magic Remote, but nothing is perfect.
I do have one serious issue though - if I try to connect the TV via ethernet directly into my network, the TV begins to have a "wired network connected"/"wired network disconnected" cycle. For a while, I just removed the connection and switched to WiFi, but MediaLink has issues with high-bandwidth shows on WiFi. So, I'm trying to reconnect the wired ethernet. As long as there is an active stream of data, it works (and handles the higher bandwidth), but once you go back to just watching regular TV, the "wired network disconnected" message starts popping up. To make it even more obnoxious, it apparently gracefully fails over the the WiFi but when the wired network "reconnects", it pops up a dialog box asking if you want to revert to wired network.
This just repeats ad nauseum about every 90 seconds. Needless to say, I yanked the ethernet.
Has anybody else had this problem? For all I know, I have a dodgy switch (although it is a brand new Netgear 5-port switch for the TV and Blu-Ray player, which in turn routes to a Cisco 16-port business-class switch, so it should be fine). No other piece of equipment on the network complains, so I'm assuming it's a problem with the TV.