The thing that makes this setup superior to the cheaper one size fits all rigs is that is made for one gun. The gun fits perfectly and locks in place. You don't have to look down and fumble with some adjustable thumb break that doesn't really fit in the first place. With the Serpa you can reholster in a second while never taking your eyes off target/threat. It cost more, but this is professional grade gear. If your are just into weekend airsoft games then cheaper gear may be okay.
Pros: Fast draw, equally fast and secure reholster
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.