I had a terrible experience with the UN46ES7100. I ordered one from Amazon towards the end of May. It arrived in early June and I was super impressed with the sleek design of the set. Unfortunately, I the picture quality was one of the absolute worst sets I've seen in a long time. I calibrated extensively but the picture always appeared either extremely grainy or lacking any detail. All of the adjustments made yielded the same result of a washed out picture that lacked clarity, detail, and refinement.
I tried a variety of devices: Directv H25, PS3 (game / BD movie), Xbox 360), everything looked absolutely awful. I can't help thinking that the internal processing of the signal is deeply flawed. Whether or not my television was an anomaly or this is representative of the whole line remains to be seen. I returned the television a week later because it made any and all viewing on the set pure misery.
Before this model, I tried both the LG LM7600 (46 in), and the Samsung UN46ES6600. The LG had better picture quality, but I found it difficult to get an overall picture I was truly happy with. The media center functions were amazing, it played every format I threw at it via the computer and even displayed subtitled; everything via the computer was sharp and clear. I could never get Directv to look amazing on it, and the remote began to get on my nerves as well. The Samsung 6600 is a practically unacknowledged model and looked halfway decent, but has serious QC issues. The back of the unit bulged and sound resonated against the bulge, which made the entire metal backing vibrate. The picture quality was decent but nothing to write home about.
I compared all of these units against a UN55C7000, which is our downstairs television. I haven't been able to replicate the overall quality of that picture against any 2012 models, which is extremely disappointing. I've been considering checking out the 7500 series to see if the picture quality is substantially better than the 7100. I can't stand the thought of gestures/voice control and I've read some very negative reviews. At this rate, I might just wait until next year's models come out; the lack of 4 HDMI ports upsets me greatly.
I would be very interested to hear from other 7100 owners if the TV I experienced was truly a defective product, or if they agree with my sentiments.