You're going to get seriously mixed opinions on them - so mine is just as good as the next.
I've run them for the past 2 years and they are *very* firm. The average pothole or bump in the road which is unnoticable on a normal car - feels like driving over a speed bump on budget coilies.
The damping and rebound rate is far from ideal, I find myself bouncing in the seat driving down the m'way - not fun for the 250 mile Manchester > Glasgow drive.
Having said that, over my 20 yr old spring/damper combination, it corners much tighter - but the ride comfort has been comprimised substantially.
I think the going rate is £170ish for them, I know I'd rather save the extra money and get a decent spring/shock combo.
You'll find everyone is right about not adjusting the coilys more than once. I set mine on my original wheels, then when I changed my alloys, I set them up again - that was about 18 months ago. Remember - each time you adjust them, you need to get your tracking set up again, so about £25+ per shot.