Regarding its availability, I think it's sad that they dropped support for Symbian OS. I wonder what made them drop an existing platform - I would've understood not bothering to develop for a new one, but not drop an existing.
Could it be that the glasses also tell you which tools you'll need, allowing you to plan ahead, whereas the alternative is to fetch a tool when you need it?
I don't think they have an advantage, as I've noticed that kids knowing their way around their phone are often completely lost when put in front of a computer. They never use the computer, they have everything in their phones. Compared to a computer, a phone is simple, and you aren't actually solving any problems while using it (you're just downloading and running apps). When you have a phone, however, there's no need to learn the computer. This means that they're missing out on the computer learning curve that we experienced.
After a long addiction where I had used my phones as projects rather than tools, I decided to unwind. The blinking notification light was the first one to go, as I couldn't concentrate when it was active (which was most of the time). The next step was to buy a huge battery which made my phone twice as thick, but I only needed to charge it every few days which was a huge thing not having to worry about constantly. After a couple of weeks I started disabling more and more of the apps which made my phone buzz, and at the end I had only the most basic apps.
At the final step I realized that I had a huge expensive phone with only basic functionality and a web browser that always seemed to steal my attention (procrastinating on the web). I bought a Nokia C5-00 (dumbphone) and told my family that if they needed to reach me, they'd have to text or call - everything else would be dealt with a couple of times a day on my tablet.
It's been a year, and I love the freedom to work and be with friends and family without constantly having my phone in my face. I also seem to handle boring situations much better as I no longer can rely on my phone to entertain me whenever I have 3 minutes to spare. I am now a 22 year old Swedish programmer with a dumbphone that I charge once every 1-2 weeks, and I love it. Also, the reactions from co-workers and train conductors scanning my SMS-tickets are very interesting.
Doesn't that just redirect you to Google's search results (encrypted.google.com), and thus makes the point of using DuckDuckGo in the first place unnecessary?
I'd like to add a fourth choice: ask every time. When the app wants to access your GPS coordinates, you can grant it temporarily. Much like Android's integrity tools (maybe it's just a Cyanogenmod feature) where you can choose to be asked every time an app wants to access some kind of data.