A friend of mine got 2 of these from the Kickstarter a bit over a year ago. We found the build quality was pretty average and the on/off switch on one of them broke the first time it was used!
The app was ok but was really limited by the silly, and really unreliable, connection through the headphone jack. I know they didn't have a choice with the iPhone/iPad but it would have been nice to have a proper usb connection on Android devices.
When they worked they were pretty good and capable of getting nice results, but the batteries died and wouldn't hold charge after about 2 months so that was the end of that expensive story
Maybe they've sorted some of the build quality issues now though...?
Here is a quick timelapse I did with one while waiting for the sky to clear:
https://www.youtube.com/watch?v=wrH5RP35XDo