The Michelin Primacy 4+ is a summer tyre that has received positive feedback in various tests. Its most commonly mentioned qualities include being very balanced and performing well on both wet and dry roads. It also has a very high predicted lifespan and a good environmental performance. However, some tests have noted that the tyre lacks sharpness in dry handling and braking. Nonetheless, it is praised for its low noise, high comfort levels, and low rolling resistance. Overall, the Michelin Primacy 4+ is a safe and reliable tyre for summer driving.