Trigger shoes can give the similar shape and size of a S&W target trigger, but they certainly don't do anything as far as improving triggers. Their purpose is strictly improving contact feel of your trigger finger on the trigger. Most people like the wider surface area vs. the narrow triggers that tend to "cut" into your finger during long matches.
A typical bullseye match is 30 shots for each type of pistol, and three pistols used. .22RF, Any Centerfire, and .45ACP. So 90 rounds fired during a match. Doesn't sound like a lot for those who shoot or plink casually, but it does create finger fatigue for shooters over a match.