The Shotloc, whether direct from Shotloc or SKLZ, is not worth purchasing. From my experience, I am not convinced that its spreading of fingers and putting space on the palm really had any positive long term “muscle memory” effect on my shooting. The product is not expensive at under $20, however, and if you feel you have very strong difficulty spreading your fingers or are helping a young child learn to shoot for the first time, I could see Shotloc helping.
The Shotloc does a great job of making sure you follow-through on your shot. You basically have to because you can’t shoot unevenly with it on, it forces all of your fingers to fold together. If anything, using the Shotloc forces finger strength because to get a shot off, you have to push off with your fingertips. This makes the ball feel a little bit loose to me, and when you shoot from longer distance you really have to accelerate the spin on the ball coming off your fingertips to generate power.
So, while shooting with the Shotloc seems to create good habits, I could not see any real changes to my form and results after extensive training with it, and then playing without it. For more evidence and research into Shotloc’s effectiveness, see this research paper from the Sport Biomechanics Laboratory at the University of Manitoba, “The effectiveness of the ShotLoc training tool on basketball free throw performance and technique.”
(Note: I initially reviewed the Shotloc nearly 4 years ago. I am revisiting the review and condensing it for easier consumption in this new article as well as reviewing what I wrote, removing biases with hindsight. For more of my basketball training product reviews, click here)