Harmony 900 offers a very good experience overall. I am quite happy.

This is what I'd improve to the device itself:

1. Touch screen responsiveness (increase it)
2. Touch screen sensitivity (increase it)
3. Physical switch to easily disable/enable the touchscreen (to be added)

Physical keys are excellent, instead.

Yes, software could be improved in many ways, but after the initial setup and few days of fine tuning, I found myself using it less and less. Last time I used is probably 1 year ago. So, if it only did not depend on an Internet data link, I'd be happy.