hot tuning coil overs: worth it?

Hottuning.co.uk are selling coilovers on Ebay for <?200. Are they worth it? Anyone fitted these before.

I want to drop my convertible by approx 40mm. Any reccomendations?

http://www.vwgolfmk1.org.uk/modules.php?name=Forums&amp;file=viewtopic&amp;t=51015