you get what you pay for, you want decent set up, and a decent ride then spend £500.
if you want your car low for a cheap price then they are perfect. iv used them on vauxhalls as well and no complaints really. the ride is pretty hard and has a lot of rebound so you get that bouncy effect.
i would suggest you replace the top mounts and bearings for the sake of £20.
also you will rub on the anti roll bar if lowered to much. this can be over come by using a r32 or mk1 audi tt anti roll bar. this is best replaced by a garage due to the nature of it all. ie its a pain in the ass. then you will need some adjustable drop links £40.
i personally changed my wishbones at the same time too!