In the past I had the same K70 with just blue LED's which I fell in love with (until the LEDs started dying one by one) so in a way it feels like a reunion. The fundamentals of the keyboard are exactly the same as that which was perfect already. The lighting which is new to me, seems bloody brilliant. When I got my M65 RGB not too long ago I was a little underwhelmed by the lighting options despite being very pleased with the mouse overall. Luckily I'm the kind of person who will set it the way I like and not change it again for years.
The lighting on this keyboard probably won’t lose its novelty factor for me for quite a while because from what I can tell the possibilities are almost endless. My initial reaction is that it was well worth the wait. As long as no LEDs start dying or any unforeseen issues occur I’m happy as Larry and never intend on changing my keyboard/mouse ever again.
A couple of pics I took when first plugging it in: