The Gadget is the primary reason that Glocks have remained my go-to striker guns even after multiple generations of arguably better striker guns from various manufacturers have been released. Every Glock I use for training/practice is equipped with one. If I could install them on my work Glocks, I would do so without a second thought. They provide a huge safety benefit without any negatives other than cost. I wish all guns came with some kind of hammer/Gadget capability.
One thing that has been discussed numerous times on this forum is whether or not the ability to quickly reholster a pistol, potentially without the chance to look the gun into the holster, is a necessary skill for gun carriers. Many experienced forum members believe it is an important skill for LEOs and private citizens. I happen to agree and can imagine numerous scenarios where the threat has changed from a potential shooting problem to a hands on problem quickly. The Gadget makes doing so safer because it allows you to feel any pressure that’s being exerted on the trigger while reholstering. If possible, I always look the gun into the holster when reholstering. The Gadget is an additional layer of safety on top of that. If I don’t have the opportunity to look the gun into the holster, at least the Gadget would allow me to know that something is going wrong in the holstering process so I don’t shoot myself. I’d rather have to wrestle someone with a gun in my hand because I couldn’t holster safely than wrestle someone with both hands free but with a gunshot wound to my lower body from holstering with an obstruction that caught the trigger.