I'm still using the Grolsch 'washers' on my Martin. They have never slipped off and, therefore, the strap has never popped off either (as opposed to once or twice a week without the washers). My guitar buddy bought me a set of the Fender washers (I think they were ten bucks :eek: ) but they remain unused waiting for the beer version to wear out. Sadly, I have yet to find any Grolsch in the megalopolis of Missoula, MT. An alternative source I haven't tried is a shop that caters to home brewers. The washers they sell are cheap but usually come in packs of 50 or 100.
The Lock-It strap is a dream. "Snap", it's on the Gibson, "snap" it's off. [U]Super[/U] secure and if one is looking for one solution for all/most guitars take a serious look at Lock-It.
I'm still using a 'regular' strap on the Ovation. The leather ends are stiff and the guitar's buttons are huge. The combination makes for a tight and secure strap.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins