CodeMan,
There are about 4 diff UIs for Homeseer:
Touchpad - part of Homeseer. easy to use, integrated with HS, some call it a bit Cheesy.
Media Center UI - optional plugin for HS, limited configurability, not very extendable.
Maestro - Flash UI that looks better than the above, pretty easy to configure, limited to Homeseer, currently low to middle price but will raise in price as it gets more refined. Fairly new and immature, doesn't seem to be a very large user base today. Seems like the developer is responsive to issues. Not configurable.
MainLobby - most expensive of the above three ($159 plus MLHSPlugin for $40), highly configurable and expandable, takes a medium learning curve, best looking of probably any user interface for HA and media, mature product (in this young field), well supported. Many optional addons that add much capability, and cost. Many device drivers and when added to the Homeseer driver support, unmatched by any. The ML / HS combo is the most powerful in the HA market (IMHO
). There is also a brand new HAI plugin for MainLobby server that should be production this week. It has been in succesful beta for a couple of months.