It's been four days that I use.
Handy, especially when you've got expensive guitars you want to see miserably crashing to the ground. Yeah AC would be a shame ...

I did not try at Dunlop's model, I only know one who is well thought it must be said. It looks complicated at first but in fact it is easy and efficient.
Think occasionally tighten the proximity switch is installed on the nut that holds the strap fastening system that is located on the strap and is fixed to the party is on the guitar.

I took two pairs, installed on a Stratocaster and a Les Paul. Beware if the strap is too thick, must touch a bit (removing a little material at the hole of the strap) because it's not fit otherwise.

Value / price means it's a shame because it is convenient but it's really expensive for what it is.
But two products in one: avoid his guitar back down.
Allows you to detach / attach the strap to the guitar many times as you want without enlarge the hole in the strap may break and / or dropping the guitar. Practice!

Yes of course I would do with the experience that choice. But this time I will not buy them, I'll steal because it's too expensive.