Castaban,

Are you having issues with individual commands, such as mute on/off or just when powering up and down where lots of commands are sent in a sequentially?

I am mostly having the latter. This morning I was using the mute on/off as a test and found that while the active angle is lessor than my old 880, it is still not that bad.
Mute on/off worked repeatably.

I mostly have issues with a device or two not turning on or off, or missing one of many commands, at power up or down.
I had changed nothing in my system but the remote. Transferred all the delay setting exactly as they were from one remote to the other. I have increased the delay times to 2x what they were yet I have issues. This is still a mystery to me unless the Harmony one has one or more variables that do not scale exactly like they did in the 880.