Google Glass - To Buy or Not to Buy?

I recently went to a Google Glass event, got to test out a pair, etc. I just got an invite to purchase a pair. I had a great time messing around with them in the confined space etc, but I'm trying to figure out if they are worth the $1500 (I mean, I could buy a new Air with that money).

Has anyone purchased them and used them day to day? My fear is the novelty wears off quickly, and I'm better off waiting 6 months or whatever it is until they are less than $1500, say $500. Is anyone regretting their decision to purchase them and be an early adopter?

Thanks for any/all input in advance.