I have been using Schallers since I bought my first guitar at 18 and have never experienced any of these problems. The locking mechanism that holds the strap on is solid enough that you could swing your guitar around by its strap like Nikki Sixx and pretty much never have to worry about it flying off. Under normal use, I can't see how the guitar would slip off the strap. Regardless, strap locks are infinitely more reliable than standard strap pegs, and Schallers stick out less on the guitar than stock. I have never had a problem putting my guitar in its case once it has been equipped with them.