I've never even considered trying it but a friend I ride with swears by it. IIRC he uses some ~£10-15 in ear Sony things bought from the high street and I've never heard him say a bad word against them.
I'd guess you need to spend enough to get OK build quality but not too much as decent sound quality will be wasted with bike/wind noise in the background.
I'd guess you need to spend enough to get OK build quality but not too much as decent sound quality will be wasted with bike/wind noise in the background.