I've driven a 718 Boxster S.
Sound aside, the engine is phenomenal. It pulls like an absolute train, so much torque everywhere, easily as quick if not quick than my 997.2 in practically every situation. Interior is lovely, everything is where it's supposed to be and works well, the suspension and chassis is an improvement on the 981 etc. It's the best sports car regular money can buy.
BUT
It sounds like a hoover. Flat four turbos can sound awesome, but with equal length manifolds then nope. I've not heard one with the PSE yet so maybe that sounds better, but I doubt it. I could get used to it, but IMHO Porsche have really dropped the ball on that which is odd, as they managed to make the 3L turbo lump in the 991.2 cars sound superb.