The Hot 150 is larger than the discontinued Hot-1, but fit neatly under the sink.
It is not as loud as the Hot-1. I also like the faucet choices and got one that nearly matches our satin nickel sink faucet.

Have only used it for 6 weeks but all is good. I hope it lasts longer than the Hot-1 models (which seems to last 3-4 years before leaking).

I needed to go to the hardware store to get a ferrule to complete the water connection, which was a little frustrating. I would suggest including this part in with the unit; it should not increase cost much.

So far, so good!