I don't own one myself, but I have seen how bright they are. I 3D print light spill shades for the community and right now I have a whole lot of orders to fill specifically for the Neptune Sky. I make light spill shades for the Radion lights as well, but lately it has been all Neptune Sky. There are a few threads over on reef2reef about these lights in particular, but some people feel like they are too expensive or too new to judge. To each his own in this hobby. It's expensive and fun and people like their expensive toys (including myself). I've seen coral grown under all different lights. I think some like the latest and greatest technology along with the seemless nature of the Apex/Neptune products.
Just my $.02