I have the Harmony and I think it's great. You just push the button labelled "Watch TV", "Watch a Movie" or "Listen to Music" among others, and it takes care of everything else.
The hard thing for my peoples is the projector needs to have time to boot up before you try to switch the input, and the remote will wait a certain amount of time and then send the command to switch the input - by then, my users have long since thrown it on the coffee table and lapse into a state of utter confusion, even though they have been told may times to keep it pointed at the projector until the green light goes out.
But that has nothing to do with the receiver - your problems should be quite simple compared tot hat one - as long as they point the correct end of the remote at the receiver