Have one of the clear ones and it is excellent.
The light was on my bike when I bought it so I have no idea where it was bought from.
One thing though,I put the bike through the MOT last week and the examiner noticed that there is no reflector,he passed the bike as he was a biker himself but I suppose some awkward examiner might not have passed it,so check with the seller if there is a reflector in the unit.
If there isnt one its a quick fix anyway,just stick a reflector somewhere around the number plate.
Wouldnt like to see your bike failing an MOT on something that im sure most people would never think about checking.