I recently fitted the Alfaholics rear ARB to the back of my twin spark. I now have a Fiat Coupe ARB at the front, standard springs (KYB) all round, standard rear dampers (KYB) and Konis set to the softest setting at the front.
I have to agree to the effect the rear Alfaholics bar has, the steering is amazingly sharp, there is a total absence of body roll and due to the standard springs / dampers, the ride is actually compliant and pretty comfy. The garage that did the work have commented that it is the best handling Gtv they have ever driven.
There was one small downside to fitting the Alfaholics rear ARB to a twin spark, and that is that due to the different hub pillars on the 2L and 3L cars (giving the 3L their slightly wider track), I had to use the inner adjustment holes, ie the more roll resistant setting otherwise the drop links would foul on the brake calipers. (I have since bought front and rear pillars from a 3L with the same ABS sensor position to enable me to widen the track and also fit the Brembo 305mm brakes to the front.)
I've always been annoyed with the seats, although there are plenty here who seem to like them. They look fantastic but just don't give me any support. I opened up the side bolsters and stuffed some memory foam I had cut to shape from an old mattress topper in and now I am much happier with them. Best thing is that it hasn't changed their look.