Take a look through their blog- they had a year of end user involvement- testing, evaluation and so on.
What's interesting to me is that all the people that I know that own rental properties have outsourced the handling for a %age of the rent. That may be a cultural thing though, but from what I know about the market typically landlords are interested in the monthly payment, not in dealing with the tenants, if they can afford it at all they'll get someone to do it for them.
Maybe that's the market this is aimed at, agencies rather than DIY landlords?