[Vracer111]

Just realize if you go with allseasons you are basically taking the middle road and not excelling at anything unlike a summer + winter tire combo (which both excell in their performance envelope). Well allseasons do excell at one thing usually, and that it being able to last a lot of miles compared to summer or winter dedicated tires. Allseason will not have the heat resistance (more for on track/autocross use) or dry and wet handling ability of a good summer tire nor will it have the cold resistance and snow/ice performance of a dedicated winter tire. If the FR-S is your one and only a daily driver and you just care more about tire mileage and having it competent enough year round over getting everything out of the chassis both in terms of feel and performance, then good allseasons will work. If you demand more and are a driving enthusiast that puts handling and feel above all else, then allseasons fall short and summer tires are a must (along with dedicated winter tires if needed).

The FR-S is not your average vehicle in terms of how it handles and feels to drive... it's a thoroughbred sports car, not something 'sporty' based off a regular passenger vehicle/hatchback chassis. It will extract everthing it can out of allseasons no problem because of its exquisite chassis, but allseasons will limit it's performance and driver connection to the road compared to dedicated summers... If it will be driven in winter/cold conditions then you have to make the choice of allseasons year round or a set of summer and winter tires (if needed.) If not going to be driven in winter/cold conditions, then going with summer tires would really improve how the FR-S feels to drive.

Like was said by Spuds, tires are the single most important thing - they determines how the car reacts and handles as they are the interface between the road and the car. So the environment the vehicle will be driven in needs to factor in choosing what to go with along with driver performance expectation of the vehicle.