I sold one of my two Harmony One remotes on eBay and have replaced it with a Harmony 900. The upgrade doesn't amount to anything for me but I wanted a new toy. I lost $70 on my One based on the price I paid for the One, ignoring the 900 price, so even if I thought the 900 was a big improvement, I wouldn't repace the second one. Right now with three systems in the house, one has a Harmony 880, one has a One, and the Home Theater uses a 900. My back up is the Harmony 650, the best value of any of them in my opinion. I will say the battery for the 880/One/900 is pretty remarkable, even though I have purchased back up batteries, none have ever gone bad after over three years on two of them. Admittedly with only two humans living in the house and only one of the two able to operate the various systems, nothing is worked very hard but I thought lithium ion batteries would die after a couple of years.