Its apparently good enough that it can sync with Office365
As of January 2016 this is the only option I see for exchange sync with the ability to rearrange like Outlook.
I paid for the extra fields and assumed I would be able to sort by those (or the other non-in-app purchase fields). The only way to sort is by date. No luck.
So what does it do that built in Reminders doesnt? You pay $6 to be able to rearrange by dragging (but not a hold and drag like you expect) and to be able to edit Outlook fields.
quandmeme about
TaskTask for Outlook Tasks, v5.1