I purchased my Backup a few weeks ago. So far I have run about 150 rounds through it. Fun little gun to shoot and well made (which I expected since I have owned a SS IV for a number of years). The only “problem” I have experienced is going back and forth between the SS IV and the Backup. The trigger on the Backup is so much better than the SS IV (I was never really in love with that trigger but I was getting used to it). The SS IV was sent in for the upgrade so I am hoping I will be back to enjoying both of them soon. Will let you know.
(Note From Bond Arms: The Triggers have been refined in the past few years, contact us if you want to look into the trigger upgrade)