Eibach Coilovers are mint and SOME coilover kits can give a more comfortable ride and better handling than some spring and shock kits.
Coilovers - do not go for anything below £500 in price, seriously anything below that is SHITE being in the tuning trade and had experience with ALL manufacturers here is what I think and had personal and what customers have found that have used a good amount of them:
All of the above coilovers are really stiff and bouncy DO NOT have the correct spring & damper rates and will more than likely break of some sort within the first year. AVOID IF POSSIBLE - ONLY GOOD FOR LOOKS!!!
The parts for these coilovers are made in China but they are put together and tested at KW Automotive in Germany. Good coilovers but these are actually designed with only covering the warranty period which is 2 years. After this the dampers tend to leak - rears more than anything.
Made and put together by KW Automotive - much better than AP for an extra £50-100 as they have much better dampers but again you will find that the dampers may leak after 3-4 years.
Fantastic Coilovers from V1 Inox (not basic) to V3 anything road use I would go for V1 others such as a lot on track or FULL track car then V2 or V3. AGAIN after a couple 3-4 years you may find the dampers leaking.
BRILLAINT - Comfortable and great road holding, Eibachs springs are really made well for every car!! They use KW Dampers that are re-valved by Eibach but you may still find dampers leaking after 3-4 years.
NEVER Heard a bad thing about these OTHER THAN they are stiff - brilliant for a weekend/track car IIRC they use Bilstein dampers and their own springs.
Of recent they are shite this is due to the production of all KONI suspension moved to Poland (IIRC), the damper quality has gone downhill and the springs have never been that good - put your money in to another kit.
By far the best if you ask me! BUT my god do you have to pay for it. Again reports of being stiff but they do have damper adjustment on PSS9 and PSS10 kits.
My 2p's worth