I absolutely love the look of the RS650. Clean, modern, looks nice. We had noise issues initially, until we got the flow valve adjusted. Even so, it has once woken me up at 4 am making loud gurgling noises. Adjusted the flow valve and went back to bed.
The LED lighting is amazing, but connectivity has been an issue. It took forever to get the lights all paired up and working as parent and child x3. Even so, half the time when I access the MyAI app it won't connect. And last night, after I went to bed early for work, I noticed the tank lights were quite bright when the wife opened the bedroom door. They shouldn't have been, as I have it programmed to be a dim purple at night. When I got up early this morning I could see from the light coming under the bedroom door that the tank lights were still bright. So, from the bathroom, I tried to dim them from my phone. Couldn't connect. However, when I exited the bedroom the lights had now, inexplicably, switched to the dimmer setting. I have no idea what's going on.
And one final note, the pump that sits in the sump under the tank requires some sort of foam to keep it from making noise as it vibrates against the sump. Apparently my installers didn't know that and threw it away, thinking it was packing material. So until my replacement foam comes, it's noisy. If you get a RS650 make sure they keep the foam pad for the pump!