Handling is much more predictable as well. I found the air suspension to get too stiff when driving on the highway. That said, I have the Strutmasters kit and it is supposed to emulate the S-Type R setup, minus CATS which does mean it's still a fairly stiff ride for my VDP and is noticeable at low speeds due to this. I actually wouldn't want it softer, but I wish it sat lower and will at some point find the right springs to swap in to lower it an inch. I also saved weight by removing all suspension components including the module, compressor, and tank and have even contemplated tracing and removing all air lines.

 

This is how my 2005 Jaguar XJ8L appeared after the Arnott coil/spring conversion. The local Goodyear Service Center obviously did a fabulous job with this as everything came out perfectly (close) within specs!

 

Here are three other photos that were taken of my 2005 Jaguar XJ8L after the Arnott coil/spring conversion:

 

Looks good. I should follow up my comments to say my car does sit at stock level, I just wish I had the option to lower it with coils.