I use this with a Glock 26 in a FatBoy Versipack, and it fits nicely. The fastener is secure and simple to set up. The band fastens around the pistol's trigger guard. Since a Glock has a stout, angular trigger guard, it works flawlessly. This system may not work for a 1911 style or pistol with smooth/rounded trigger guard. 
Pros: Easy to set up in a Versipack, Simple design, Great for Glocks or pistols with angular trigger guards.
Cons: May not be a secure solution for 1911 style or pistols with smooth/rounded trigger guards.
                    
This review was written in the old system and had content requirements that are different than reviews written today.