ADHRS or GPS ????

I have started to hear a fair amount of buzz around my home base about Dynon's portable EFIS. At first glance the unit looks like a glass panel. The question is...how will it feel in flight? Seems like a nice back-up unit for GA pilots comfortable with a glass flight deck. This is a gps unit disguised as an adhrs..very compelling. (dynonavionics.com) Plus d'info...