Gonna chime in here because my experience has been mixed, and coincidentally I just switched away from them today.
I bought 2 90w units at launch and loved them. The app was so so in terms of stability and hit or miss with regards to device compatibility, but once I had them set up everything ran smoothly.
My initial concern was with a low light patch right under my center brace that I was getting some shading related mortality in. Since the brace wasn't going anywhere, and a 90w directly over the brave wouldn't solve my problem, I opted for 2 50w units straddling the center brace.
While it's easy to integrate and group EITHER 50w OR 90w models, the app won't allow a mixed model group. So any changes need to be made across 3 device groups (the 90w group and two individual 50w units). I have contacted and been rebuffed by Red Sea half a dozen times with this issue, asking with increasing connectivity issues over the months. Sometimes my set program came back after connectivity was lost, sometimes the leds would revert to a much higher intensity than I had set.
Overall, the hardware gets a 9/10 (come on red sea, match the blue/white wattage ratios on the 50 and 90w models). Beautiful blending, gorgeous caustic, solid color rendition and growth.
How this hardware is executed, however, leaves a lot left to be desired. They haven't developed a lighting ecosystem, but rather ecosystems that lack the flexibility that a single unified experience could provide.
So I'm going to set up a frag tank soon, these will power that system. My 2 Radion G5 Pros are now over my display. I think I'll be happier this way.