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There was a thread about them on here once, but it mysteriously disappeared.
In 1995 I bought a Fender Vintage guitar strap - thin, black leather, padded shoulder strap - used it hundreds of times with a LP mostly. Unfortunately, it wasn't long enough for the Gretsch my missus bought me for a wedding present (first world problems ) so I also bought a longer Levy's Vintage strap.
Over the years I wanted to buy another leather strap, but they were either too wide, too busy or waaay too expensive. Last year, at the Great British Guitar Show, I tried one of Heistercamp's straps with a Les Paul and took a brochure.
Next I was chatting to Nigel from Heistercamp and despite the show special offer, said the straps were nice but not for me (too wide, the wrong colour, didn't have a shoulder pad or metal buckles or whatever). He said you can pick a strap and customise the options. So I bought one. It arrived a few weeks later and is just what I wanted.* The only thing I didn't like was the cow logo stamped into the shoulder pad and buckle (some things I like to be plain and unbranded), but I quickly came to like it (small cowboys, leather chaps for trading-posts - marvellous).
*Arch Tor strap, black leather, Chili Red suede inside the shoulder pad, Antique Silver colour metal and punched for Schaller (or Dunlop) straplocks.