GT4, reading it back I may have sounded harsh on the Cayman GT4, it is a very good car, that could possibly have been better if Porsche let the engine play more in the upper rev range and a shorter final drive or set of gear ratios.
We both know why Porsche didn't do either of those things and that is not to step on the halo model range where they can make more profit. The 997.2 GT3 RS had shorter gear ratios than the GT3, so they can do this when it suits.
What I was trying to get across with the CS-S is that VW have taken a regular GTi and upped the anti for more serious use. There was no real part of the car that didn't feel up to par, I am talking about engine, ride, steering and overall feedback here.
The only area you could perhaps criticize is that they didn't go far enough in weight reduction, but then removal of sound deadening and headlining soon makes a car tiring on a long road journey, so you need to be a little unhinged to accept this.
I have a 230 bhp Gti PP as my road car, in daily use I have never been amazed at the performance of a Golf R and am fully aware that a well driven GTD will perform much the same as mine, except for economy where I concede.
As a road car I do honestly think the CS-S would grate after a while. Yesterday I drove my GTi over the same route and it was great fun, on UK roads you don't need that much power, just enough to get out of trouble when required, rather than constantly landing in trouble.
The regular GTi has parking sensors and adaptive cruise, I use and rate both highly in a daily driver. Depending on your build, the bolsters of the CS-S seats may become a pain, they will certainly wear more quickly than the regular seat.
Just looking at the camber on the CS-Sset up, you can see this car was developed with the intent to be more of a weapon than the regular GTi.
Do you need another weapon in your armoury alongside the GT4, that is down to you.
In your position, I would take delivery of the car, experience it and then make your judgement, I personally think it will be far better as an occasional car where every drive is an event.