This is an extremely useful feature. It has changed the way I use tasks. And added significant value to TD and UTDL.
A couple of tweaks could make it even more valuable. I firmly believe these location perimeters (or something like these) will become the industry standard for all programs as location base tasks become more the norm.
Location radius: the ability to set the trigger radias by location, not by general setting across program. This becomes useful if you want to go to a part of the city say, and do a task when you are over that way.
Trigger on entry/exit: A simple setting to trigger the reminder based on either when you enter a task location zone, or when you exit. Great for reminders when you leave your house to not forget to take the...