The 880 is comprable to the MX-850 bot in capabilities and price with a list of $399. The problem I have with Harmony remotes is the need to be able to access the internet. I can show up with my laptop and program the MX-850 without having to go on line. This is a big benifit for me.
The other problems with the Harmony is they make some really low cost units that many people think will do the high cost operations. The MX-850 is not as well known, so people do not over anticipate what it can do like they do the low cost Harmonys.