Currently I am using a Harmony 659 to control an LG Plasma HD TV, Sony STR-DA555ES Receiver, Sony DVP-S550D DVD Player, JVC XV-N40 Multi-Region DVD Player and a Pace DC-550 HD Cable Box. All works very well except that the line of sight to the Cable Box and both DVD Players is obstructed by an armchair, I have to point the Harmony 'ove' the armchair to get the devices to repond to commands.
I am considering buying a Harmony 890. Would that be the answer for me?
How is the AV Control unit set up ? Does it have to be connected in some way to the devices? On the Logitech Web Site it looks as though there is some sort of cable connected to the AV Control Unit?? Could I place the AV Unit on the armchair and could I still control the TV and the Receiver by IR?
I would welcome your advice and input whether a 890 would be the answer.
Thanks

I also own a 659 and I am considering a 880 or 890. On this site one writer said stick with the 659 as he didn't like the button feel/layout of his new 880. There seems to be way too many software problems with the 890 although they promise some fix next week. I may delay my purchase in the meanwhile. This didn't answer your question but I guess wait and see if the software problems get sorted next week on the 890.

Just buy an IR repeater like the hot link pro and you can use any model Harmony remote (or any other universal remote) and you won't have to deal with the 890 problems.

Logitech has been releasing new firmware almost every week since december for the 890 if that gives you an idea of how stable it is. Please do not make the same mistake I and many others have made - make sure you can return it, and experiment early before your 30 days are up.