Ive had plenty of ebay pile of ABS crap .... they crack, they don't fit properly, the last one I had to put it over a cooker so the plastic got warm and soft enough for me to mould on to my car!!!!!!!!!!!!!!!!!!!!!!!
But, but but but butttttt ... these Wagenwerks ones could be the best you'll get considering their direct fitment and flexible and at £20 a go can't go wrong.
However, theirs always going to be people that can't live without genuine ones, so any info would still be appreciated just so people have the option.