Like you, I am looking to use an Android based tablet to be a uinversal remote. In searching the LogiTech support forums apparently they DO NOT SUPPORT ANDROID ON TABLETS AS OF 1-24-2012!
They will support use of the software on iPad and Android on the phones but NOT on tablets.
A real shame as I would have purchased the Harmony but not now. They have lost my business for any universal remote as my needs have grown past the 90's need of one remote to control all A/V. My family and I need a universal DEVICE that enables me to surf the internet to find information that I think of based on the content I watch or listen to.
You have found some other of the companies and products I have found but have not purchased. Below is the link to the Logitech support site on this subject. This is only one thread there about Android tablet support. Clearly the folks at Logitech have determined the iPad's loss of market share to 57.6% and Android's increase to 39.1% starting nearly two years later is not significant.
http://forums.logitech.com/t5/Harmony-Link/When-will-we-see-an-Android-tablet-version/m-p/770607