So, with the price having come down so far, I decided to take one for the team and try one out. Walabot DIY is only $49.99 right now. It came yesterday. It feels cheap, all plastic, and attaches to your phone with a reuseable, really sticky rubber thing. The surprise though, it works. I only tested on my sheetrock interior walls so far though. I will try outer walls and hopefully get a chance to try plaster at a client's house soon. I'll get some screenshots and maybe a video or two to post of using it.