Very nice, dashboard and test working as expected, intuitive etc. Only comment is that from the front page I wasn't sure what I was signing up for (saw no demo)
It also wasn't obvious that you had to scroll down to read more stuff even though it was yet another Twitter Bootstrap thing that we should all know and understand in this 'sign up to our Saas startup' context.
I'm trained because it's been a year or so since apparently all startup web sites are like that, an option I've seen is to add an arrow to indicate there's more.