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I use it during weddings and engagements very regularly, it's not that difficult once you know how to do it. Including removing the lens, manual focusing etc it usually takes me around 30 seconds to nail a shot.
Here's an example from a wedding last month
It's certainly not for everyone but I enjoy it. Best with f/2 lenses in my opinion. You can do it with any Canon mount lens, with Nikon they have to be manual aperture ring lenses.