I've been using VBT for over two years now in my own training. It has been prescribed to me via my own coach and I haven't delved into the programming myself but I have experience with 2 different systems: First is Output Sports (https://www.outputsports.com/): Pros: low profile measuring device that straps to the bar, or athlete for other movements such as CMJs. Companion app is easy to use, also has a daily readiness feature which is nice for tracking self reported metrics. Cons: Pricing, was approximately $500 upfront and then a $100/year subscription. Between the 2 units I have experience with, the readings we're faster vs the other unit even when used at the same time. This led to a drop in performance, and I know for another athlete led to injury. Second is Gym Aware Flex (https://gymaware.com/flex-velocity-based-training-app/) Pros: Price. It's about the same upfront cost, but no subscription fee. App is good here as well, less features/movements, but I have more experience with this one and have had the most success so it's personal preference. Speed measurements seem more accurate at least for my N=1, and have blown through strength plateaus using it. Cons: Set up is a little trickier, especially in tight spaces. Unit attaches on the end of the barbell and needs to stay over a mat on the ground, once you've got it figured though it's no issue. I really like VBT for myself especially since weightlifting is my focus, it's a nice way to have data for self regulation which has worked in both directions for me, on days I'm slower it has held me back, and on days I'm faster it has pushed me to do weights I didn't think I could. Also, in the weightlifting world I would recommend Wil Fleming as a resource, he wrote a good book and had a nice podcast recently discussing it. https://www.amazon.com/Velocity-Based-Training-Weightlifting-Concepts-Applications/dp/1941549543