First, let me just say this: I put over 4 years and 3,500 miles on these tires before needing to replace the rear and, in all that time, I never got a single puncture. Not once. In fact, I only got a single flat in all that time, and it was a pinch flat because I was stupid and hopped a high curb with an under-inflated tire. Rider error aside, these things just can't be stopped. I love them.
Puncture Resistance
Puncture-resistance was the top selling point when I bought these tires because the roads here frequently have sharp debris on the shoulders. I got more flat tires on my mountain bike in the first couple months of living in Charleston than I did during 2 years of bike commuting in Fort Wayne. When I was building my touring/commuting bike, I knew I couldn't be dealing with flat tires every month on the way to work, so I researched the best puncture-resistant bike tires and settled on the Randonneur Pros. They have double-shielding and a Kevlar lining. After putting several thousand miles on mine, I can confidently say that it works exceedingly well. For comparison, my other bike has Mr. Tuffy tire liners inside of regular mountain bike tires. They have helped, but a couple really sharp objects have still caused flats. Not so with my Vittorias.Ride Quality
I've been very happy with the ride quality of the Randonneur Pros. They are maybe a touch on the firm side, but not in a way that detracts from the riding experience. From what I've read, this is pretty common with puncture-resistant tires. That's part of why I spent a few bucks extra on the Pros versus the regular Vittoria Randonneurs. The Pros are 120 TPI (threads-per-inch) with a folding bead, whereas the regular Randonneurs are only 30 TPI, which by all accounts provides a much harsher ride, albeit the same great puncture resistance. Other than TPI, the regular and Pro versions are identical.The tread is simple, attractive, and provides great traction on wet and dry surfaces. These tires strike a nice balance between traction, ride quality, and speed - I have never felt that they slowed me down or offered any form of resistance. Also, their width (35mm) is such that I can hop on a dirt trail, grass, or other bumpy surface and just keep going. They are also available in a 32mm width if you want something skinnier, and in a 26" option. I'm not one to focus much on weight but if you're wondering, the 35mm size weighs in at 460g.
Other Features
One of my favorite things about my Vittoria Randonneur Pros, aside from the incredible puncture resistance, is the fact that they come with an optional reflective sidewall. Why anyone would not choose this option is beyond me, because it provides excellent side-visibility in dark and low-light conditions. When headlights hit these things from the side, they light up and are immediately recognizable as bike tires. It's an added safety measure that I think works far better than the traditional spoke reflectorsAnother minor but handy feature is that they have a color indicator to let you know when you need to replace them. It takes the guesswork out of the process, and is hard to miss. That said, I *may* have used them for a while even after the red wear-indicator stripe started to show...