.... Or if your hair is OK, but your product is faulty, and/or didn't perform as stated for several months after purchase, despite the manufacturer saying that there would be an update soon.
Brown keys are usually the best choice for "all round" use. I prefered them to red keys, as I use my keyboard for typing rather than gaming.
The fact is the the K** RGB keyboards have a very nice design, are generally well built, and seem to be fairly reliable. Like any product, there will be a few that fail. One issue that put off a few people is that it took over six months after these keyboards were put on sale for Corsair to enable the claimed 16.8 million colour range (we only had 512 colours up until the firmware was updated a couple of months ago). There is now a full 16.8 million colour range available, but if you animate some of the keys, there is often a noticeable flicker on all the illuminated keys while the amimation is taking place. This may, or may not bother some users, but it is worth pointing out. There is an option to revert back to 512 colour mode which doesn't suffer from the flicker, but the colour transistions are not as fluid.
I don't think there is any way for this flicker to be solved by any future software/firmware update, as it seems to be a hardware limitation in the current RGB keyboards. Although it hasn't been confirmed, I suspect there could be a hardware revision at some point that will provide fast and fluid 16.8m colour animation (without flicker) as claimed in the product description.
As long as you are aware of the flicker issue, and are happy to accept it, then you are likely to be very pleased with a K70 RGB keyboard.