Among the people testing Google Inc.'s wearable computer are teachers, dentists, doctors, hair stylists, architects, athletes and even a zookeeper.
Some 10,000 people are trying out an early version of Glass, most of them selected as part of a contest.
The Associated Press spoke to Glass owners who have been using the device: Sarah Hill, a former TV broadcaster and current military veterans advocate, and Deborah Lee, a stay-at-home mom.
Glass is designed to work like a smartphone that's worn like a pair of glasses. Although it looks like a prop from a science fiction movie, the device is capturing imaginations beyond the realm of nerds.
The trio's favorite feature, by far, is the hands-free camera that shoots photos and video through voice commands. (Images can also be captured by pressing a small button along the top of the right frame of Glass.) They also like being able to connect to the Internet simply by tapping on the right frame of Glass to turn it on and then swiping along the same side to scroll through a menu. That menu allows them to do such things as get directions on Google's map or find a piece of information through Google's search engine. The information is shown on a thumbnail-sized transparent screen attached just above the right eye to stay out of a user's field of vision.
Among the biggest shortcomings they cited was Glass' short battery life, especially if a lot of video is being taken. Although Google says Glass should last for an entire day on a single battery charge for the typical user, Hill said there were times when she ran out of power after 90 minutes to two hours during periods when she was recording a lot of video.
Glass' speaker, which relies on a bone conduction technology, also is inadequate, according to the testers the AP interviewed. They said the speaker, which transmits sound through the skull to allow for ambient noise, can be difficult to hear in any environment other than a quiet room.
"If you are out in the street or anywhere else where there is any noise, it's impossible to hear," Lee said. "That has been challenging because there is no way to adjust it. If you could adjust the sound, I think it would solve a lot of problems."
Hill, 42, became a Glass evangelist shortly after she picked up the device at Google's New York offices in May.
"This is like having the Internet in your eye socket," Hill said. "But it's less intrusive than I thought it would be."
The liberating aspects of Glass came into sharper focus for Hill as she took a cab to the airport for her flight home. During the taxi ride, she began a video call on Google Hangout. As the cab was preparing to drop her off at the curb, Hill was about to end the call so she could carry her baggage.
"That's when it hit me that, 'Holy cow, I don't have to cut the call off,'" Hill recalled. "I could continue talking because I didn't have to hold a phone. So I carried on a conversation through the airport and people were staring at me like, 'What is that thing on your face?'"
Hill became accustomed to the quizzical looks as she wore Glass to community gatherings, restaurants and shopping excursions. The encounters usually led to her offering others to try on Glass, and most were impressed, Hill said.
Hill has already used Glass to provide a tour of the World War II memorial in Washington, D.C., for veterans who were too old or ill to make the journey themselves.
Lee, has been relying on Glass mostly to capture precious moments with her 9-month-old daughter, Maddie. Lee, 34, told Glass to take the pictures as she as tickled and kissed her daughter's tummy.
"Obviously, you can't do that with a phone in your hand, so I am totally loving Glass," Lee said. "It has really been great."
Glass also allowed Lee to set up live video sessions with her parents so they could see Maddie eat her first solid food just as she saw it. "I am capturing all these tiny moments that are really exciting with a baby," Lee said.
Glass' ability to take hands-free pictures and video has raised concerns among privacy watchdogs who believe the device will make it easier to secretly record the activities of other people. But Levy is convinced that what Glass can do isn't much different than what many people already do with their smartphones.
Some analysts question whether Glass will have mass appeal once it hits the market. Skeptics who have seen the early participants walking around wearing Glass believe the device will eventually be remembered as a geeky curiosity that never lived up to its hype.
Angela McIntyre, a research director for Gartner Inc., believes the retail price for Glass will have to plummet to $200 to make a significant dent. Early testers had to pay $1,500 for the device, though Google hopes to bring that price down by the time of its mass-market release next year.
Even then, McIntyre believes smartwatches, another type of Internet-connected device starting to appear on the market, will win a bigger following than Glass. "Most people are just more used to putting technology on their wrist," she said.
In a recent report on wearable computing, Forrester Research analyst Sarah Rotman Epps predicted Glass will appeal largely to "young, socially connected tech optimists" and professionals, such as surgeons, construction managers and even farmers, who could use the device as part of their jobs.