I realise that some folk think attaching a strap to a guitar headstock is a bit uncool but so is drilling a hole in the heel of a very nice Collings OM42!
This thing is very useful to have around in the studio as a quick fix when using fretted instruments which lack a suitable strap attachment. Especially when recording, it's a pain to be continually putting an instrument on a stand and picking it up again every time you need your hands for putting on headphones, tweaking a mic or player position, or whatever. I've had it on guitars, mandolins, mandolas, banjos, bazoukis, charangos, lauds and bandurrias. It's pretty robust and I'm happy using it even on some quite posh instruments. I've also used it on occasion for suspending chimes, bells and other dangly-tinklys.
Playing out live I'd always look for a permanent strap attachment solution on my instruments, but this is useful to have around.