Great for GTD. The simplicity of Reminders with the benefit of Smart Lists, which act like Perspectives in OmniFocus.Cons:
Initially confusing. Seems more complex than it actually is when you first use it.
GoodTask has a lot of great options for customization, but it's minimalistic in function. It did take a little while to understand the interface and settings, though.Garrett Oreilly has used this product for one week.