Another v105 user here. Pretty much identical to willclarkes experience. I find them much more confidence inspiring than the stock primacys. Even with 225/40/18 the car is still playful, especially in the wet, but they never feel sketchy and are much more progressive when they let go. Dry grip is good but not excessive, it never feels over tyred, the car still holds it momentum and doesn't scrub off too much speed.
They wear faster than the practically plastic primacys and aren't as good as Michelin PS4s (from what I've heard) but they seem well suited to this car and ideal for what you are after.