Well I am nearing the 30 day return period (01/31) on my 5K. I have been reading everyone's posts and using them to help my decision on whether to return or not. So far I have had but a couple of problem with BD titles (3:10 to Yuma, Superbad, & Ratatouille), but they all were fixed from the recent FW update. I actually have multiple HDMI inputs, both on my TV (Sony 70XBR2) & my AVR (Sony ES-5300), and I have room on my rack, so those issues were not a concern. I was fortunate enough to get the 5k for an excellent price ($661 out the door), so the price was not outrageous, or even close to the $1000 that I had initially been expecting to pay for the player.
All this being said, I was leaning towards keeping it, but the recent news of the 5K being discontinued was alarming. SO I think I came up with the solution based on what I read what one other poster stated. Given that I am still within my return period, I decided to buy some insurance. I am going to the store today and purchasing the 3-year extended warranty (about $85). If I have any problems in the future that I can't live with and/or Samsung doesn't deliver the FW upgrades as promised, I will return the player based on the fact that it is not working as it should (ie defective). At that time, I can then exchange it for a "comparable player", whether it be the 6500, etc.
In the interim, I will continue to enjoy the convenience of having one unit, eliminating clutter, and the excellent REON benefits on my massive SD collection.