The Michelin Primacy 4 tire is overall a very good tire as a consumer product if you are looking for a generally safe and well behaved tire from the start to the end of its life.
For someone who either really leans hard on their tires or is sensitive to feel and cabin noise this tire is both impressive and somewhat average at the same time.
Initially, when driving on these tires when new they are fairly quiet in terms of road noise. Road feedback is generally good for a general use orientated tire. I've driven on sporty and soft tires and the Primacy 4 sits in a very middle ground - decently firm enough to not feel completely mushy in turns but soft enough to not be trashy over even the smallest of bumps. They can be a bit harsh/crashy on some bumps or speed bumps so they are not entirely comfort focussed.
Grip in all conditions (except ice) is excellent for what is not a performance tire, and for the car they are on provide ample reserves to manage it's power and braking performance.
As they age they do get louder - as is the case for all tires - but it seems to be somewhat more apparent with the Primacy 4 versus other tires on other cars.
Grip as they age is consistent in both dry and wet capabilities even when leaning hard on the tires in corners, roundabouts, etc.
Having covered 40,000 miles on them the fronts have reached under 3mm of tread left which means time to shop for replacements - you could easily get more life out of these tires if you granny them for their entire life.
Fuel economy is very good and maintains a high level.
They've had a good run and, compared to other tires I've had on other cars as they have aged, have maintained their performance profile very well, but the road noise is off putting. I suspect this is a trade off feature of their construction which helps offer that consistency but means as those rubber blocks wear away to almost nothing that noise energy is absorbed by the underlying rubber grooves.
Would I have bought them again (not available now as superceded by the 4S and newer 5)? Possibly, the high price is off putting but you do get the milage from them so proportional value is there.
I'd have considered the 4S as a replacement but based on reviews of the newer 5 I'm not sure I'd opt for those.
Having driven on the original first version Michelin Pilot Primacy tires some 20 years earlier (on a different car), the Primacy 4 has shown they've evolved the concept well as those were similarly generally ok all round but had a few more negative points in terms of performance and wear characteristics - swapping those for performance tires felt like a big step up in every way. The Primacy 4 on the other hand (provided they are more than the car needs) are good enough to not necessarily have you wanting to get rid of them as soon as you can for something better - e.g. you could get Pilot Sport / Eagle F1 / other and get better grip at the limit but the Primacy 4 is a lot closer to that limit while being a bit better behaved overall.
