If you own firearms, its important to train with them. Spotter Up received a demonstration from Mantis X, a company who brought a seriously cool product to the market that allows you to practice at home with your personal firearms, and gives you detailed empirical feedback data to help you diagnose any deficiencies in your fundamentals.
Spotter Up review is in work.
You can purchase yours here
Sidenote: IT WORKED! the author came back after a few hours to attempt to redeem his earlier mediocre performance.