Hi Bakks,
I put the Eibach Pro-Kit springs on mine about 18 mnths ago (leaving original shocks on). Main reason (in my case) was to get rid of the jittery ride over our crappy roads (you think yours are bad Transporter - you should see ours
). They are a progressive rate spring, so the theory was that they would be softer initially than stock springs to soak up more of these small bumps, but firm up more on the bigger stuff. I'd say I am 80% happy that they achieved this aim. The added benefit is that because of the slight lowering and stiffer ride when cornering, the little beast handles like it is on rails 
My original shockies appear to be holding up OK (done about 18000km on Eibach springs) however my front upper strut mounts have failed prematurely (they are to be replaced under warranty, so possibly a common fault). I also have a rattle/knock from RH/rear somewhere, which could be something in the rear suspension but is yet to be determined. I'm sure it was there before getting springs changed, but has steadily been getting worse. Hopefully they can find it once they have replaced the strut mounts up front to get rid of the noise from them!
Cheers
2011 147TSi 7spd DSG Reflex Silver, 18" New York Alloys, Leather with MDI, ECB Nudge Bar, Viezu Tune (Work in Progress), Eibach ProKit Springs, SuperPro Poly ALK & Rear Trailing Arm Bushes, H&R 26mm Rear ASB and Whiteline HD Adjustable End-Links, VAR Design 3" Downpipe, Sprint Booster, Auto-Polar FIS+ Advanced Module, GTI Sports Pedals, Flappy Paddle Strg Wheel, LED fogs as DRL, chrome blingy bits
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