I have been using dual-monitors for some time now, like 5 years. When I first started it was a Samsung Syncmaster with a resolution of 1440x900, my second monitor has always been 1280x1024. Two years ago that monitor stopped working, then I got my first HD monitor, it is a 21.5" AOC e2250Swda. It might not be the best monitor, but I really love it so far. And when my local computer store had one in store last Friday, I picked it up to replace my old 1280x1024 monitor which was starting to gave some trouble. So far I have been enjoying it, everybody in my class says they are to small, but I love it so far. I have my laptop also hooked up to my main monitor via VGA, and use it as a extension. I will post a picture of it since I have been moving my set-up around the last couple of days. My desktop is being replaced this summer, it is a HP Pavilion P6340.nl, which I will be replacing this summer due to age. It has helped me always really well, but on some occasions it has started showing some problems. My laptop that I use for school is a Sony VAIO VPCEJ3Q1E which I love to bits, the only downside to it is that it doesn't have a 1080p screen, but that wasn't really around on laptop in 2012 when I bought it.
I currently have a iPhone 4s since last September, I really enjoy it so far. I'm planning to upgrade to the 5s ore iPhone 6 around September. I really like how it integrates with my iPad, everything was there when I signed in.
Since we don't know what you asked them, if it is something special it might take more time then usual for them to respond. But I must say for my personal experience that the response time it really fast, also after the purchase has been made. I remember that I had a big problem a few years ago, and it the end it turned out my host has some configuration wrong. Within 2 hours of reporting the ticker in the system, the error was fixed, and this also includes me contacting my hosting provider. Although on there might be cases it takes a little bit longer then normal, for example when a new version is released, the ticket support time it really good here at IPS.
Here is a good tutorial on how to use the Webdav functionality: http://community.invisionpower.com/resources/documentation/index.html/_/tutorials/skinning/externally-editing-templates-and-css-via-webdav-r626
It's just what you are used to, I have edited the IPB skin for several website, and the more time I spend with it, I found out how things worked, I don't really get that much from the XenForo code, it's just what you are used to.
It has been said before, you can not link a domain to a demo package, if you have bought a hosted community with IPS please create a ticket in the Client Area so that a staff member can link you domain with the package you have bought.