These came highly recommended for my somewhat rough country roads and occasional gravelcaliche segments of rides. Never had a flat on them. They are, however, a noisy tire, more so than Michelin, Vittoria, Hutchinson I have used. Grip was on par with other tires. Good tires but there are equally good tires that do not have the road noise.
I run 28s on both my winter training gravel bike (CX) as well as a tandem. I've ridden on all kinds of gravel roads and even on a few MTB trails with them. On the tandem we've recorded descending speeds of over 60mph and find them totally trustworthy. Logically, they are slightly heavy, but otherwise great handling, super durable, and hard wearing. My go-to tire.
I have been riding Continental tires for over 15 years - GP 4000, 4 Season and Gatorskin - I love the ride characteristics and flat resistance and durability. The 4 Seasons has become my year round road bike tire and the Gatorskin(32) is my winter street ridingcommuting tire on gravel bike. I would recommend Continental tires to any and all asking about tire recommendations.
I ride about 5000 miles a year on my road bike. I use a Conti Gatorskin on the rear and a Conti 4-Season on the front. On my last 4-Season I got 4000 miles with only one puncture which was a direct hit by a thorn I like having the 4-Season on the front because it is responsive and smooth-riding. I've tried tires from other manufacturers on the front that were also responsive and smooth-riding but not very durable-multiple punctures and low mileage. I'm sticking with the Conti 4-Season
Ride about 2,000 miles per year and have used the GP 4-season for 15 years or so. I have had very few flats, probably less than one per year on average. Great traction and handling. Hard to beat this tire at the sale price.
The Grand Prix 4-Season offers me plenty of options. Great for the road and for a bit of off-roading as well. It might require more watts to push it but look at it this way, you're getting more of workout! The grip has been great including on wet patches. It does have better puncture resistance but you will find something that can cause you to have a flat, I certainly have. At the same time I have rolled through plenty of stuff that would have flatted lesser tires. This is now my preferred tire and I love the size options as I use a 32mm.
These tires are nearly as tough as gatorskins but lighter and with better road feel. I get maybe 1-3 flats a year that are virtually inevitable no matter the tire. Cornering is confident and performance in wet conditions is also very reasonable (I've been on several other tires that are most definitely worse).
Putting these tires on my crossgravel bike made a big difference in road performance. They are ok on gravel but lose traction on steep climbs. I plan on lowering pressure and trying again, however you obviously lose performance on the tarmac in doing so.
I use these tires exclusively. I never have had a flat, and that means a lot to me. I'd much rather take a slight penalty on weight and go for a 60 mile ride knowing my chances of flatting are next to nil.
I use the Grand Prix 4-Season on both my road racing bike and my commute bike, it handles well, and offers more puncture protection than a race tire. These are great tires, rain or shine, which is especially good for those long winter months (here in Portland, OR, anyway). If you find yourself faced with snow in winter, a studded winter tire is more up your alley.
Bottom line, this tire handles nearly as well in rain as it does on dry ground. It's a great purchase for anyone who rides in all conditions, and wants a durable tire that feels good.
Like many other reviewers I am a big fan of these tires. The only improvement I'd like Conti to make is to go one size wider. If I could I'd ride a 28 on the front and one size wider in the rear during the winter months when I'm commuting in the dark.