I got my harmony 880 last week. Spent at least 2 days setting it up! It accepted all 8 of my devices very smoothly, and it works quite well! It's quite a powerful tool and you can configure it perfectly to suit your requirements. I have tested range up to 25 (No place to go any further) feet & it works fine.
The only problem I have faced is that it does not change my TV (Sony KLV-32V300A) to any HDMI input thru direct "command mode". Though it changes to other inputs like Video1,2, HD/DVD1,2 etc, even though the original remote does not offer this direct input function. (It provides cycle mode, where one need to keep pressing the input button to cycle through the input choices & select). Later I read in a few forums that a quite a few users face the same problem. No solution seems to be available as yet!
So right now for viewing any activity (Watch DVD, Watch HD Video etc.) which requires HDMI input, I need to press an additional "inputnext" button, to change to HDMI input thru the usual "cycle mode".
Right now I would give it 8/10. And if HDMI input issue is solved then 10/10.