I use it sometimes, since the plugin, other than converting color to B&W has a number of other effects such as toning, detail extraction, vignetting, etc.
Some of the presets turn out better than wha you might pick out of say AnalogEfex.
Can't hurt to try a few things and see what you come up with. I've used the Fine Art high key preset with some modifications on some scanned B&W with desirable results especially if I blend it on top of the original scanned layer.
Film (Working RF): Canon 7, Fed-2A, Argus C3, Mercury II
Digital: Olympus E-M5, E-P3