They just came in the mail last week, so just have them running on a test bench. The build quality seems good, but not having a Royal Blue to compare them too it's hard to say if the color temp is the same. They will eventually be used on a 5 gallon nano tank as actinic supplementation with 4-3 watt White Crees.
This thread on NanoReef.com has some info on the overseas leds, there is a post commenting the Satistronics BLue are very close to the Cree RB.
http://www.nano-reef.com/forums/inde...l=satistronics
For the price one can't go wrong, should have ordered some of their White Leds to see how they look.