Currently testing it on a few machines using random codec settings with ~3.5 million files. We also just switched over our title's bundle decompression step from LZMA to LZHAM, so the decompressor will be tested on many iOS devices too.
I've also tested the compression portion of the code on iOS, but I won't be able to get much coverage there before releasing it. Honestly the decompressor is much more interesting for mobile devices (that's really the whole point of LZHAM).
I'll be porting and testing LZHAM on Android within a week or so - should be easy by this point.