I think this training device is great. These kinds of devices are
tools to give instant feedback that you are not shooting straight. A lot of you are mentioned using the pocket reducers, instead of this aiming tool, but pocket reducers won't tell you that you still have a garbage stroke and can't shoot straight. Other comments are saying to use chalk or golf tees, yeah, they do the same thing as this tool, but they take longer to set up than just standing this tool up-right. I'm sure most of you are super good at pool and may think this tool seems silly, but this isn't for you, it's for the beginners, the standards, and open players who just want to get a little better. We were all crappy at pool at one time.
For any of you noobs who want to get better, the link is
https://mtlaser3dprintstudio.etsy.com