I had purchased these Harley Benton strap locks along with several other products, for my Harley Benton SC500BK, which is a really heavy guitar, and single cut style guitars usually need strap locks.
These strap locks really are amazing, and very easy to install onto the guitar, and the padded strap that i had also purchased.
Considering its a very basic product with a VERY simple locking mechanism, its not different at all from how schaller strap locks work, so you're getting more than your moneys worth.
In terms of pros: very good looking, very reliable, and easy to install
In terms of cons: nothing really.
They can hold the guitar VERY well onto the strap, and no matter how hard you're jamming out, the strap locks will NEVER become unlocked from the strap buttons NOR the strap itself.
Just remember to get the right sized wrench and bolt the locking mechanism tight to the strap, and to use a screw driver to screw the buttons onto the guitar itself. other than that, its not labor intensive AT ALL, and a very good and safe modification for ANY instrument.
cant recommend these enough, honestly. 10/10 gave it 5 stars!