When we first saw Recon Instruments' Jet at Google I/O last year, we expected to be using it to monitor our heart rate and speed on the track by fall. But alas, it wasn't to be. In November the company delayed the launch of the extreme sporting sunglasses by "a few months," and today it broke our hearts a little more -- postponing the first shipments until September 25. Adding insult to injury, if you want to snag a pair of the high-tech glasses you're also going to have to shell out a little more cash. Starting this summer the device will be priced at $699, up $100 from its original $599 price tag.The news isn't all bad. The delay is certainly disappointing, but when Jet finally hits the market it's going to be even better than the prototype we saw in 2013. Since then the company has scored some cash and assistance from the likes of Motorola and Intel. CEO Dan Eisenhardt says they've been able to "make the module-to-lens attachment mechanism more robust, improve the durability of the plastics and sealing elements (one of our main concerns), and achieve considerably better GPS antenna performance." All things that despite the release-date speed bumps, should make that first Jet ride a lot sweeter.