This has the makings of a great piece of time management, however it needs to integrate to other core software to create an inbox.
One of the big advantages is that GTD does a bottom up review against your projects – you review each incoming data to decide how it fits in your time. This feels more top down, and I personally particularly like this, however information comes at you at apace so the ability to deal with is needed.
The not use problem is the lack of sub-projects – life is complicated, and without breaking it down into chunks projects get unmanageable.\
Close but no cigar