+Brandon Allgood was one of the first Project Glass Explorers to receive and play around with Google Glass and he shared his experience on Google+.

Here are highlights taken from his first impressions of Google Glass:

Light and comfortable
Battery lasted all day
Some friends and co-workers were uncomfortable around them (I assume privacy) but most loved it
He learned his habits need to adapt (i.e. not reach for phone or computer)
Low light pictures and video are not great
Loved Google Now embedded
Speech to text worked great
Taking photos or videos are without frames, so it is hard to tell the exact orientation of the picture until after it is taken
When wearing sun shades, people don’t know you are wearing Glass

TechCrunch also as a first day with Glass.

Robert Scoble has a great audio review of it as well:

Forum discussion at Google+.