Porsche 986 Boxster S Tyres

42,000 miles on my 2005 Porsche Boxster S and I'm recently put on the 3rd set of tires. They're slightly fragil when road or driveway conditions are concerned, but dry ttraction was never in question. When pushed very hard, they communicated their intentions with clarity. I don't push as hard in the wet, but still verrrry good traction. Braking and steering feel also are excellent, (No understeer until stupid sets in). Tire noise is never an issue.
While on a 6,800 mile 2 week vacation I had a sidewall bulge on the L/F. Replaced 2 fronts with Nitto 235/35ZR19 and the grip loss was obvious. 35 series tires must be treated with care as potholes and concrete expansion have both caused me failures, (1 bulge & 1 bead cut).
Mileage is quite acceptable for the way I drive and the places. 10k to 20k miles should be expected for a 3,000 lb. car driven briskly.
I'll continue to buy these tires for this car.

Coming from the Pirelli p-zero Rosso, I was pleasantly surprised. The Eagle F1 Asymmetric handles far better on both the dry and the wet. These tyres have the same "feeling" of pliability and grip as racing compounds. I disagree with a previous comment that they are "vague". In fact, feedback is impressive. To top it all, they remedy corner entry for my car: No more understeer!

Replaced my Uniroyal Rainsport 2 with a set of Falken F452. Bedded the tyres in and after that I drove as per normal. First thing I found out was that white lining is a bit of a problem. Secondly the wet weather grip is not all that I hoped. In the wet it is a bit like driving by the seat of your pants it gets a little twitchy this is at moderate speeds.
Would I buy another set, probably not. They are good value for money and may suit other vehicles better than the Porsche. The wear rate is good. These were bought after reading tyre reviews.
Next set I am thinking of some Vredestein Sessanta

I am currently on my fourth(!) set of these tires (225/40/18 fronts and 265/35/18 rears). Under normal street driving, always with the manufacturer's recommended pressures, the tires eventually develop what feels like flat spots but is more properly described as "radial force variation". The shake can be very intense and disconcerting - enough to make you worry about tire integrity and overall safety.

Severity is not constant - it depends on tire temperature (I believe) and it is much worse after having decelerated from high speed, e.g. from 120mph (I am in Europe). The shimmy is present when braking, rolling, or accelerating but it is felt only past 70 mph or so. It does not go away at higher speeds but it becomes less intense due to the higher frequency. It does not feel like coming always from the front wheels.

Hard cornering or repeated hard braking have, intermittently and to a varying degree, succeeded in alleviating the problem, only temporarily: It returns with a vengeance either the next day or after a bit of driving.

Testing (over months) with combinations of different rims and tires has excluded every other possible cause. Brake rotors were replaced, wheel bearings too, anything rubber in the suspension is good. Balancing also seems perfect. (Unfortunately no shop here has a balancer that exerts a force on the tire - like the Hunter in the USA). In short, putting different tires on my rims (even if they are used), without changing anything else, solves the problem immediately.

I have not moved to a different brand/model because the local Pirelli distributor have already replaced the tires thrice(!) for me - free of charge (do they know something is up? where there any "bad" batches that have found their way into the market?). This last set was fine for a couple of months and, for no apparent reason, it now developed the problem.

I should say that grip and response are very good in general so, if not for this problem, the tire would be excellent.