Part of me is fascinated that someone would actually do something like that, part of me is horrified. For now the horror seems to win out. The price seems pretty excessive and in the end the only thing that changes here is the interface that you use to get the information. Want to know where magnetic North is ? Get a compass and look at it. That will tell you. A flux meter will tell you all you will ever need to know about the magnetic fields around you.

Our eyes and ears are high bandwidth and using custom made sensors that output images and sounds that we can interpret we can enter a very large amount of information about our environment without so much as a drop of blood.

To literally have a 6th or 7th sense is very interesting but it really is just another low bandwidth channel that can easily be simulated using some tech and our existing sensors.