I have seen many posts on this subject of series suspension upgrades and many different views.
I thought for reference I would let everybody know what parts I've fitted and how well they perform.
I have a petrol S3 109 and have made the following suspension mods
Parabolics from Paddocks ProComp 3000 Gas Shocks from Paddocks 1 ton extended shackles from Paddocks 2.5 degree axle correction wedges from Chris Parfect Extra long braided brake hoses from Chris Parfect Standard LR bushes all round
Total cost £500+
The total lift is very significant, I haven't taken any measurements but the roof line is level with 90's with a 2" lift and much more difficult to climb in and out of.
My previous springs were only 12 month old.
Ride quality is greatly improved but not up to coil standards. You get a bounce over road bumps instead of a judder
If you jump up and down on the front bumper you get real suspension movement and not just tyre wall flex.
Off road the axle articulation is excellent, not better than coilers but you will not be embarrassed easily
There has been a slight increase in steering wander and I may try increased axle correction wedges at some point but this may be down to the ext shackles, but it's not enough to worry me
I haven't suffered with prop vibration that some people have commented on in the passed.
I have done circa 500 road miles and 30 on lanes with no problems so far
If anybody is interested I will post an update in a couple of month's time.