I saw Hickock 45 on OyTube flogging these - or at least the ad came up on his channel.
Dry fire. Put a small target up on the wall, load your gat with snap caps (made especially for dry fire practice). Pull through the trigger, when the hammer falls - note where your sights fall. Practice safe handling so that it becomes second nature too.
I have shot against the pros and when they blow a shot, they know where it went. They remember exactly where the sights were when the hammer fell, and they can tell by the recoil of they might have pooched something else in the aiming, squeeze, follow up in the shooting process.
Snap caps are a far better use for your money. And ammo - real ammo, of course! :)