Ok, back on track now.
"C. What is the difference between mainlobby and Maestro interfaces?
They are both offered on the HS web page and I am not sure if I will
need one or both? I am thinking about Mainlobby but wanted to make
sure."
Maestro is very new and truly is a front end to Homeseer. MainLobby is a complete home automation system that can also be used as a front end for Homeseer (or others). The advantage to MainLobby here is any devices that Cinemar supports that Homeseer doesn't can be used by either when ML and HS are integrated together.
Maestro leverages the user's setup of Homeseer more effectively than MainLobby / MLHSPlugin does today. What that means is that if you define a HS house code to be a "Light", then Maestro continues that catagorization in it's user interface. With MainLobby you design your scenes and put graphical representation of a "light" on that scene and then associate it with the Homeseer device.
This brings up one of the core differences: With Maestro you get one person's idea of what a great user interface should look like, navigate, colors, etc. Because it's "locked down", it makes it much easier to programatically work easier "out of the box". With MainLobby, you can either reuse the interface that comes with MainLobby 3 or modify it, or throw it away and start from scratch, or reuse user contributed scenes and build your system the way YOU want it. To match your house. To match your interiour paint scheme. For the hardware you want to control.
If you are just looking for a quick update of a pretty user interface for Homeseer, then Maestro may be a good bet. Still too new in my opinion to know if the bugs are worked out.
If you are looking for a customizable front end for Homeseer, then MainLobby is the best there is (there goes that "best" word again

) As the MLHSPlugin is Homeseer's largest selling plugin, that should tell you something. Maestro hasn't been around long enough to expect to compete with that fact.
Maestro is cheaper than MainLobby. MainLobby 3 combo is $149 plus MLHSPlugin is $40. But, Maestro says that their prices will increase beyond the introductory price which is something like $135. MainLobby has many additional addons which does raise the price, but Maestro doesn't have many updates yet at all and no pricing on things that don't exist yet. If you act fast, you can still purchase MainLobby 2 for $59 which works just fine for Homeseer. This is available either from Homeseer's shopping cart or direct from Cinemar.
Hope this helps.