I’m still having issues with data on my SD card getting corrupted (resulting in audible glitches) all the time. I’ve already tried several SD cards but no luck so far. But since there are obiously lots of folks around here that are using w/, this doesn’t seem to be an issue with the module in general. Apart from that, I never experienced any issues with the module.
I think I’ve read somewhere around here about an upcoming firmware update, but I’m not sure and don’t have any details about that. But I’m really hope that it will maybe solve these issues, so I can finally use this awesome module without unwanted noises, cracks and glichtes 
Also, I’m still hoping that the firmware will one day become open source - at least there’s already this Github repo, but it’s still empty…