I have had these in for a good week or so - installed them on a couple of guitars and they are testing out very well. Also installed one onto a chunk of 2X2, and REALLY tested the shadizzle out of it. Stuck the 2x2 into a vice.... put my strap on the button and yanked and pulled and twisted and jerked for six or seven minutes. Gradually ramped up to really extreme pulling, maybe sixty/seventy pounds lifting kind of pull. - I pulled so hard I only quit when I could hear and feel fibers tearing apart in the body of the strap. The sides of the pin did bend slightly under VERY extreme testing near the end after pulling on the strap directly outward from the "guitar", which I don't see much of in real life. Even still, THE STRAP DID NOT WANT TO SLIP OFF - and the screw did not pull out. And I was tired when it was done LOL A regular stock guitar pin/screw would not have held a strap on for the first thirty or forty seconds of the punishment I dealt to this button. I did NOT test a so-called "locking" system beside this, but I would guestimate the screw on one of those would have pulled out or broken off maybe at the five minute mark. I am going to call these good. Better than good... far superior. As a vote of confidence, I want you guys to know I will be installing them onto ALL of my guitars, in coming weeks and months, as I get around to it. (edit - the solid body ones, and maybe the semis) ************************** For now... unless you are adventurous these are for solidbody guitars or other applications where you have at least 1" deep of wood to work with (5" of paulownia or 10" of basswood LOL) The cool thing is, the two regular STOCK straps I tried went onto the pins without too much bother. Wasn't exactly easy, but not that difficult either. Strong guitar playing toneful hands will not have an issue. I can also build my own straps to accommodate these easy. They will be for sale soon, I'm not exactly sure of a price point, but I figure if the other guys can sell theirs for eight or ten bucks a set, I'm thinking I can set these at six plus shipping costs (which I don't know yet). Maybe I'll do a "buy three pairs get another pair free" kind of deal. As of today, a set will be included with every new Well-Hung strap sold. I'll let the new strap folks test them if they wish, and I do expect some excitement from it. I may eventually raise the price of my straps a bit to build some cost in, but any current straps I have for sale right now will remain at the same price. I do hope to put them out on Reverb in the New Year as a standalone item To some these buttons may seem like a simple, perhaps trivial thing. However, if you've ever had your guitar strap slip off a pin, or a screw pull out of your guitar you know what a heart-stopping moment of terror and anxiety it is. These pins are designed to specifically put an end to such tomfoolery, and regular folks here understand I have put quite an amount of thought and experimentation into the matter. I also have kind of have a vested interest in "guitar security" or well-hunged-ness. One silly thing, I thought I ordered a set of "black" ones with silver writing, but as will happen with those chinese folks, (even though i sent them a freakin' visual mockup), I got a set of gunmetal with silver writing, along with nickle with black writing shown above, which I happen to like a little better. Here's a pic of them both for comparison I'll probably include the gunmetal ones with the straps, LOL LOL EDIT - PRO-Pins, Pro-Buttons... whatever I'm going to call them, they are good!