eBay adjustable clipon opinions?

[Snatchers]

Hi guys wanted the know if anyone has used these http://www.ebay.co.uk/itm/201012330542?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT adjustable clipons and if so are they worth getting or should i just go for a a full top yoke conversion ?

[maviczap]

Someone on here got the same or similar, said they were very good for the money.

But in a more subtle black