Lots of opinions being expressed on the forum at the moment so as a satisfied owner I will add mine.
I have had the 55x8509c since mid-November 2015. I had read and digested the posts on this forum beforehand so I had a pretty good idea of what I as getting myself into.
I have installed the updates as they have been issued, on the day of issue, and not had a problem with any of them. I have never had to resort to a factory reset.
I run a fairly straightforward setup with SkyHD, Blu-Ray player, Sony sound bar and a 64gb USB memory stick for recording on Freeview which gives me the option of three concurrent recordings. I have only recently tested the recording facility but so far so good with everything behaving as it should after adjusting the start time options.
I don't run YouView so I can't comment on either it's implementation or effect on the TV in general. I had originally planned running a 1Tb hard drive off the HDR USB socket but I couldn't find any info about whether tthe socket was permanently power on so decided against it. I will invest in a 128gb stick and that will more than suffice for my needs.
I have the tv hooked to our broadband via the Ethernet connection into TP Link power line adapters which I would highly recommend. We get a maximum of 16mb/s from BT broadband but I have no problems with buffering or interruptions streaming material from Netflix or Amazon Video and the Ethernet connection has proved very reliable. That includes UHD programs where I thought it may not cope but it does.
I don't have problems with lip sync and I had only just started to look out for it when they brought out the December update, definitely no problems since then. I am also getting 5.1 on Amazon video which appears to be a problem for some other users.
In the interests of being reqsonably objective I will say there are some operations that don't really fit with my idea of a good user interface, i.e. not as intuitive as I would like. However, this is a tv and what is being presented is the convergence of the needs of a tv user with that of a computer user so I think there is room for a little flexibility and understanding while that situation evolves.
And did I mention the picture? Well, it's outstanding and I have seen no other model in the price range to match it.
I will freely admit there was a time around early January when I was giving consideration to returning the set but I realised my motivation for doing so was what I was reading on this forum and what could happen rather than my actual experience with the tv itself. That moment passed and I would now say that as long as you are aware of possible limitations with this particular tv then I would highly recommend it. For those who have purchased and are unhappy it seems your only recourse is to return the set as it appears the major firmware upgrades needed to fulfill on the original spec have been implemented. I am guessing that anything else in this area of any real significance is unlikely until the next Andriod release.
