The Exputt is actually pretty neat! It shows a lot of data points - similar to my Blast sensor - but more in-depth and on a TV screen.
I love the idea of practicing my lag putts with it and seeing my stroke actually pan out way down the line on the big screen - I don't have a ton of space in my basement so this has been my one saving grace for practicing them Lo0oOooong puttZ
I've become pretty automatic with 10 footers on the sim, and I've found myself more confident over these putts out on the course.
Is it worth the $400 price tag? IMHO - Yes. I get to practice my putting indoors and it has kept my stroke more consistent out on the course.
Plus, I can play games with my family and friends that don't know a single thing about golf!