I got the chance to play with a Google Glass at work.
Battery life is short
Physical interface/control is clever but actually a bit of a pain to use.
The image/picture is amazingly clear and bright.
I can't think of a real use for one yet. The only 'real' use I've heard for them is for a Head up Display for people such as glider/paraglider pilots, racing cycle teams (so team leader to send info), etc.
If you want to film stuff, the google glass isn't the thing.