So far it appears that Vizio has followed its CES 2014 release schedule of its new line of HDTVs and UHDTVs as the company then stated the E-line would be released first, then the M-Line during Summer, then the P-Line in the Fall followed by the R-line before end of the year.
It is now barely halfway through Summer and Vizio is just releasing its M-line in sizes 55", 60" and 70" following the introduction of the E-line afaik
, and considering how many different LCD manufacturers are now offering UHD panels in many sizes (especially larger sizes) i don't see why Vizio "can't deliver the goods" of the R-line by the end of the year, which essentially consists of only one model in 65" size (stupidly !) as i think that 120" P-Series "humongousity" is more a proof-of-concept product than anything else, that Vizio wants to show it can compete with the likes of Samsung/LG/Sharp/Sony in releasing UHDTVs in sizes bigger than 90"; Good luck trying to move (very carefully) these panels at home through hallways, stairs, doors, etc for installation, all at a cost upwards of $50,000.00.
As for making buying decisions based on what LCD models look like as displayed at Walmart, Costco, Sam's Club, etc, we all know it is a moot point starting with what display mode they are using ("movie", "standard", "b/w", "bright", etc) continuing with selected color/brightness/contrast/sharpness used and ending with the huge amount of fluorescent lights overhead and all over the stores.
Personally i find that HDTVs and UHDTVs test reports done by Sound & Vision magazine to be some of the most thorough in the business (can't say the same about their testing procedure for other A/V gear), they are honest enough to put in print test reports of products that turn out to be poorly built or designed (even though they might still get 4 stars out of 5 !)and when it comes to contrast ratios the magazine does a true job by testing maximum onscreen brightness and minimum black floor level achievable after calibration, and that is why you are never going to see contrast ratios of 1.000.000.00:1" or some other crazy claim like that.
I have been in this "business" of buying A/G gear for 40 years now (hobby? illness?) and one thing i learned is to be patient (very) with new equipment introduction and product reliability; I am keeping my eyes on that 70" P-Series UHDTV but i wouldn't purchase one until i read reliable test reports and until the production line has had time to iron out any "wrinkles", which means about four months wait after release of model to consider its purchase, at which point i would buy it locally due to the technology, size and fragility involved and make sure there is full returns/no question asked policy, just in case of problems.