ACTUEL  I have been using the latest 1.1.4 and have been very pleased. the last 2 weeks i've been testing iGTD, kinkless, Actiontastic and the last few days Inbox.

Maybe the recent version is more stable then prior version folks are moaning about. So far zero stability issues and no crashes on my macbook pro running 10.4.8. I have no problem recomending this software to anyone.

i hope to continue to see more development. Additionally, more documentation and possible videocast covering the depth of this app would have been nice. I have managed to find my way around but it takes a minute to understand the hierarchical structure.

i'd say Midnight Inbox and iGTD are clear winners in my finding so far.   
(Version 1.1.4)