Dude good find! I checked it out, emailed a question via their web form … got a direct answer the next morning, went and ordered … got a shipping notification the very next day…
Fyi for anyone else interested… it’s currently on sale, plus you can use promo code “delta” for -10% off.
The idea is pretty simple = hit the triangle “puck” straight; if it doesn’t then your face angle (most likely) was open or closed at impact.
Yeah your path could be off but I’m guessing you’d probably push or pull the Delta off the mat pretty quickly…?
There are, of course, three sides on the triangle and this device uses them to give you three levels of difficulty - Amateur, Pro, Tour.
I’ll post more after I get it and try it out.