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From Fellrnr.com, Running tips
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I love having a heads-up display, and while my previous [[Solos Smart Glasses]] worked, they had too many flaws. So, I brought a pair of Engo-2 smart glasses, which use the ActiveLook OLED display. The display is bounced off the inside of the glasses into your eyes, so it appears to float in front of you. Like most technology, there are pros and cons to these glasses, but I think they are well worth it for interval training or racing.
=The Good=
* Having a constant display of data is awesome for interval training. When running hard, you can't keep looking at your watch. It's a similar story when racing, we're having a continual display of your data helps keep you on track.
* The battery life is okay for most people but wouldn't support ultrarunning. You can't charge the glasses while you're wearing them.
* Unlike many other expensive sunglasses, these don't have interchangeable lenses. You can now get them with photochromic lenses, which I'd recommend over the dark glasses I have.
* The support from Engo may be a little patchy. There are reports of issues, and I've experienced a delay of a couple of weeks before they got back to me. However, when they did respond, I was sent replacement glasses that arrived within two days.
[[File:ActiveLook Glasses.jpg|center|thumb|300px|Here you can see the electronics bulge, which interferes with depth perception.]]