Yes, mono Pepper is a wonderful listening experience. When I bought a CD-recorder a few years ago, I started transferring my vinyl onto CD (doing my own Ebbets needledrops!). I was blown away by the mono Pepper, as I hadn't played my mono vinyl for years: my ears were in the habit of the stereo CD, and had forgotten that mono gem. Superb!
Mono white album is also good, but I prefer the stereo version I have to say. The pull of the mono White is in the different mixes: eg, Guitar Gently, Piggies, Helter Skelter, etc etc.