I like red effects most of the time, so these might be good in one of my builds.
But I just priced them, and they are not so cheap.
I'm seeing 15 bucks for one and a Corsair RGB 120mm fan is 19.99.
The Enermax TB-Vegas fans that I've been using lately are the same price and the lighting is programmable in many ways.
I think that these may be an idea who's time hasn't come yet. (at least at these prices)