No I haven't seen this particular bulb in action, it's only a new product he started stocking so he only posted about them today and as soon as I seen it I thought of this thread.
My personal feelings on lighting especially led is the cheaper it usually is, the lower the quality and results will be. It's one of those things you don't really want to skimp on as it will generally only cost you more money in the long run. Leds are still considered a "new" type of lighting when it comes to the aquarium hobby in New Zealand so it's hard to get good local advice from really experienced users, and we don't have too much choice in locally available stock so we have to go overseas to get what we want and rely on other overseas hobbyists reviews that have used them for quite some time.
A mixture of blue/white has been the accepted lighting in reefing for so long now and most of the most amazing reef tanks in the world are lit this way. It's only recently that there has been available units with other spectrums of light so it's still pretty early to say if it is going to make a huge difference to reefing and coral growth other than making them look more appealing. I think it's excellent and will definitely be buying a mixed spectrum light as I enjoy looking at corals and fish under lighting other than a white/blue mix.