I haven't noticed any issues with the Cinema Black. It works very well with movies and cut scenes in video games. I did notice that an all black screen will sometimes "trick" the bars into brightening back up but that may be so you don't see the gradual drop off in the black level. I've only noticed that at night in a dark room.
When at a typical viewing distance, head on, the black level is GREAT. The Smart LED only dims a little for most scenes, it mainly brightens the picture more than anything, which is really good for scenes with the sun in the background, it makes the scene look very life like. I haven't noticed any odd dimming behaviors. The one thing I had to get used to is when the TV dims very low in dark scenes which will sometimes kill the brightness of light sources like torches and candles if they are small and have enough black around them. This can happen on all 3 Smart LED settings to a similar effect. Perhaps Samsung were trying to reduce halo effects but the geometry of the bright light source has to be about a quarter or so in size before the TV will illuminate the screen in that section. Perhaps future updates can make the algorithms more sensitive to bright geometries, but for now it's perfectly tolerable since it rarely happens in movies. The only time this becomes really apparent is during credit sequences.
I'd suggest watching a few opening and closing credit sequences of a white text and a black background and just fiddling with the Smart LED setting until you find your happy medium. I personally have the Smart LED on HIGH. I dig the incredibly deep black levels and the soft on the eyes contrast of white text.
Overall, I wouldn't even worry about the "glitches" people have talked about, I'm very picky and haven't noticed anything odd. I totally understand it's edge-lit and I don't at all expect perfect precise dimming like on full array sets. The native black level is impressive as it is, particularly during the daytime. I wouldn't worry about it. This TV kicks some serious ass.
Someone had posted 2 65" sets that had some vertical banding when looking off angle. I have the 55" and my screen uniformity is near perfect from any angle (very minor 1 cm long flash light in the corner, not visible during daytime viewing, you have to look for it during the night to see it). I did notice small light bleed spots around the top left and bottom right when looking extremely off angle onto a black screen but from dead on or just normal viewing, you can't see it at all.
If you have any concerns about uniformity, I'd highly recommend getting the TV from a local retailer who has multiple units in stock just in case you need to do an in-store exchange. Nothing sucks more than waiting several days for a replacement fearing it'll be defective too and that it wasted several days on your return period. That'd be my advice. And to think about whether stepping the size up is worth it or not, I'd look at some in-store models of the two sizes and also consulting a few "view distance calculators" which will tell you the optimum size for your viewing room.
With the price drop yesterday, now is the time to buy unless you want to wait another couple months for the next price drop. I bought mine at the beginning of the previous price drop and have been enjoying the set ever since. Judging on how much the firmware updates have improved the TV, it's only going to get even better from now on. I very happy so say that I will be enjoying this set for years to come until OLED is main stream. This will totally keep me satisfied until then. The picture is that great.
If you want to wait for the next gen, keep in mind that the starting price for the 60" will be like $3,500+ and $3,000+ for the 55". Your best bet is to just get the F8000. It'll save you a hell of a lot of money and you're getting a very high quality set that's fairly future proof. I would also say that the 2013 or 2014 models should be the last LED set you ever buy because OLED is just around the corner by the time your 2013 or 2014 model is ready for an upgrade to OLED. I plan on keeping my F8000 until OLED is matured and inexpensive (less than $3,000 for the flagship). I'm going to try to ignore all the latest new TV's to keep away my needless upgrading urges until then.