Cougar makes good fans. I've been slowly switching my 120mm and 140mm case fans to these as they do a good job of moving a lot of air and have a nice pressure change over the fan and quiet at the same time.
I have 2 of these in the front of my antec p280 and believe me they are a lot quieter than I thought they'd be! I used to have Corsair air series fans that run at 30dba and whew 2 of those suckers were like a jet engine. I still worry if my computer is turned on with these fans in there.
These fans have been around for almost a year, it's just that Cougar only recently publicized it by a video. These are basically cougar's budget mass-market fans, they don't perform anywhere near as good as their Vortex series.
I find LEDs To be quite functional on case fans. Gives me a graphic indicator on to being time to clean my intake filters. I have a few of the original Cougar fans on my radiator and they work quite well. Might get 3 of these for intake on my M8.