I have to say that I got way more than my $4 out of this little endeavor. It turned out to be pretty freakin' cool. I had a bit of an issue getting the lighting right. It won't work if it can't see all the dots but it tells you to back up, come forward, move left, etc. Until it sees everything. Then you stand and pivot when it tells you and after 11 pivots you are done and you can get the results.
Measuring your ownself is doable. It's just a big old PIA. This is easy and fun. Now... it's not perfect. My right ankle is way smaller than my left. But, hey, my socks accommodate and that's all I sew that needs ankle measurements.
This is pretty freakin' cool.