I have Piper and Saucerfull on a "pirated" LP from Andrey Tropillo, in stereo. There is a legend that Paul McCartney said he'll never come to Russia after he listened to White Album "remastered" by Tropillo

But I have to admit that it's one of the best from 4 or 5 White Album remixes that I have heard.
Mono releases on CD are funny. One of the worst that I have is "Something Else" by the Kinks. It sounds awful.