I drove a C4 GTS Cab for my session at the Porsche Driving Experience Center and it was amazing. I also drove it on the road in PDK form back to back with a Manual C4 GTS Coupe and it was equally brilliant. Slightly softer riding than the Coupe which in many ways is good thing. If I am honest I much preferred it, but I think that was much about it having PDK whereas the Coupe was manual.
For me the PDK was massively more involving and rewarding - the manual was slower and having to change gear took my attention away from braking, weight transfer and turn in. I was shocked but I thought the manual was horrible (and yes, I can heel and toe, double de-clutch etc as I've raced Caterhams). It made the car feel like a dinosaur Vs PDK . Then we got caught in traffic! At which point PDK wins by an even bigger margin. I really had a very strong reaction against the manual. I was shocked, but glad I drove it myself as a combination of mag review, youtube channels and chat online had almost convinced me to go back to a manual after my PDK C4s.
But I digress. The Cab rode massively better. It just flowed where the Coupe pogoed. I was seriously worried that I had messed up when ordering as I went for -20mm on the strength of that test drive, only to find out later the cab (which I preferred) was only -10mm. But subsequently I've come to think it had more to do with the Cab being run in where the Coupe had less than 100 miles on the clock. It honestly felt like the Coupe still had its delivery blocks in. Thankfully mine is much more supple, but I still really rate the ride in the Cab. Roof up it felt just like a Coupe to me.
I am doubtful that it would need Axle lift in a Cab unless your drive is at 45 degrees! I don't really need it on my Coupe which is -20mm. Not unhappy to have it through as it makes me laugh!