If these sound cold and harsh, they're being underpowered. With a high quality source, they're warm and smooth with a nice little soundstage. Very enjoyable.
Good review though.

I seriously doubt the above comment. They're incredibly cheap earphones. Almost anything will scale with a good source or amping, but a bottom-end IEM won't suddenly be without harshness or go from zero soundstage to a observable depth with a change in source.