After trying this it seems to not be very IE friendly but I'm sure Sandy is working out these various issues.
If you are installing this in its present state you will find if you are an IE user that it fails to allow you to configure it properly. Use firefox and it works great with no errors on the backend configuration side.
The only issues I faced were that concerning IE. Which in my case represents over 70% of my visitors. I used this to float a subsite from our site and I was quite impressed on how it worked and looked in Firefox, but some minor work is needed to make it compatible to look and feel the same in IE.
All and all, another fine piece of work from Sandy, a few fixes and I'd say a great addon for all us Joomie's to look into. I've been very happy with the quick support and suggestions from Sandy as well.
Make sure to set an image in the config with firefox and you will not have a broken link error with IE, soemthing I believe Sandy is as well looking into.