I am a Conti fan, having settled in on the Grand Prix 4 Season tire as my go for many years, after trying several different brands. I got a new road bike a year ago, and thought I wold give the 5000's a try when the OEM tires gave way. Those were Specialized Turbo Pro's, and based on my previous experience with Specs, I thought they would be shot after 500 miles. In fact, I got 3150 out of the rear, and 4000 on the front!
Once I was fully on the 5000's I noticed 2 things right away - they are indeed smooth, fast, and grippy, but the sizing is a little questionable. I moved from being a 700x23 @120psi diehard, to 25's, and with the new bike, 28's running 75 psi F, 85 psi R. (I am 6'2", 180 lbs). If you're an old diehard skinny tire rider, do yourself a favor and try something different - easily just as fast, and waaaay more comfortable. When I mounted the 5000's it was immediately clear that although labelled 28's they were no bigger than 25's. So if you're looking for bigger tires, I would suggest going all the way to 32's - that's what I plan to do if these last long enough to be worth repeating.
The rear tire has 900+ miles on it now, and is showing considerable wear. Lots of cuts and nicks, with one fairly small cut having nicked a cord of the casing. By contrast, the Spec's had many more and deeper cuts, without a single injury to the casing. In fact on removal I saw that the sidewall had been cut along the radial line about 1" all the way to the casing, yet the tire performed flawlessly!
A word about rubber- these 5000's new out of box had noticeably less rubber on the wear surface than my 4000 mile worn Spec did!
If I can get 2000 miles flat free, I will consider another pair. The Specs went their entire life flat free, which is amazing. Plus they were a dream to ride.
Some reviewers commented on sidewall weakness. So far, no problems. Also, others say tires difficult to mount, but mine went on pretty easily, FYI. Lastly, I believe these are an improvement over the 4000's, as my experience with those was that they flatted like crazy.
Thank you for your feedback.