I have one. The biggest trick I've had to find was to set the Harmony to leave the cable box on all the time (I had to email support there to find the right option). If you don't have a cable box it wouldn't be an issue. Admittedly, I don't use the harmony much while watching Replay, but I use it for switching between replay, direct from the cable box (including HD), HD OTA receiver, DVD, etc.
I'm not sure what you're doing but you cannot simply put the above code as it is. If you look at the beginning, you'll see phrases: "Select your activity", "Select your device", etc. What that means is that you have to replace those section with your own information. If you don't understand how the process works you should learn more about Harmony XML structure from tech support and documentation. Alternatively, you can do pretty much any setup without using XML.
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