I am a big fan of mono's cases and I wanted to get a matching strap.
While I do agree that it feels super solid and it is comfortable, it is not perfect. It is more comfortable than other 8cm wide straps but nowhere near a 11cm wide strap.
I have an issue with the material of the strap underside, it grips clothing harder than your general leather straps, so it doesn't slide. If you tend to adjust your guitar angle by sliding the strap, it becomes a lot more difficult when using this one.