Organize seems to be umm… well: "inspired" by OmniFocus. However, OmniFocus is probably the best app in this field, so it is worth to be copied. And, if you need an OmniFocus clone that works on Windows as well, Organize may be interesting for you. It does add some features to the original, like the ability to link multiple contexts to tasks. Also it looks quite nice, though with some design inconsistencies.
However, personally, I didn't feel the extended features brought me much else than adding clutter, in fact these distracted me more than helped. It feels a bit like with Windows; if you take an elegant, in itself perfect model (the Mac) and then just add any feature that any user ever thought he'd need, you are in danger of ending up with a completely bloated piece of crap. Now, Organize is far from being that, it is a very good app, but I wouldn't trade OmniFocus for it. Somehow it lacks the "great idea" behind it.
Having said that, I don't post this as a review of Organize, the app is quite new to judge about it, and actually it is a very good start and one can just wish it and the developers a good future. There is certainly a place in the market for this app.