Just watching their screen shot demos .. it looks a lot like the theory behind " life balance " from
www.llamagraphics.com
top goals with sub goals and all rated in relevance to the structure above it . Neither is a replacement for OF . but Life balance is 49 on the mac app store and there's a iphone version for 19 [cheaper than goal scape ]
Life Balance is billed as a " total life manager " but it and I"m guessing goal scape are good tools for managing the " higher levels " on the GTD runway .