I'm still running first gen Radions. I've also thought of upgrading, but I always stop myself because I ask myself "why?". The gen 1 Radions are old and lack some of the colors and features of the newer fixtures, but I've never had any issues with corals that make me think that I need a different light or that I'm missing a spectrum. Of all the equipment I've ever bought over my years of reefkeeping, I think the Radions are the best product I've ever bought actually. I'm actually surprised they're still running and functioning perfectly... especially when you consider how much younger this led technology was when I bought them 4.5 years ago. I'll probably keep running them until they either break or if I start seeing something weird in my tank that is attributed to the light aging.