Well I'm pleased to say that they are not bad at all. I purchased one as a replacement for a cracked and brittle original and for the very reasonable price of £33 it's a pretty good likeness and looks to be good quality. From more than a couple of feet away you'd struggle to tell the difference, with only very slightly thicker text and a stainless steel bezel marking the 'fake' from the real thing. Make sure that you get the shallow case version, or you may find that your headlight reflector fouls.
OBB seal of approval awarded.
This is the real thing
This is 20% of the price of the real thing