Now, keep in mind that Checkmark is specifically for the iPhone; it'll run on your iPad, but only in compatibility mode. And though there is an iCloud sync option (which is more for backup than anything else), the lack of a Mac or Web-based client means that you're really only going to be editing your lists on your iPhone. While those features would be nice, it's also clear that they'd ramp up the complexity of the app considerably.
So if you're looking for a little more power when creating your reminders, and especially if you're dissatisfied with the state of Apple's own location-based reminders, Checkmark 2 is definitely worth a look.
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