500 miles on 27x1-1/4 Conti Gatorskins: 5 flats (1 foreign object puncture, 2 from my cheap rim tape and 2 pinch flats)
200 miles on 700x28 Bontrager Race Lite Hardcases: 1 flat: roofing nail. this should've been riddled with pinch flats based the distance between hitting the tire and stopping (probably at least a mile because the only place any construction occured was at least a mile from my apt complex and I didn't notice the flat till I got home.)

I keep both sets at near as i can figure it the perfect pressure, so my conclusion is that cheap rims and bad rim tape are probably more grief than midrange tires (my pinch flats occured on the exact 2 days I was too lazy to check mytire pressure)

If you want absolutely indestructible tires - get Specialized Infinity Armadillo. You will be able to run over Rambo`s knife:)
BUT, it is like riding on the brick.

She tells me I'm too cheap and should buy more expensive tires... but of course her own tires are cheapies, and now I'm using name-brand ones, so go figure...

i got a flat last night on my armadillo. apparently i ran over a rock shaped like a claw that got into one of the tread grooves, and then punctured through and pricked the innertube. strangest thing is, i wasn't even riding hard, or on strange terrain.

I have found that most of my punctures occur at about 60-65 psi on my Marathons (55-95 psi) and if I go over 85 psi so I try to keep it in the middle now at about 75-80 and they seem a lot better. I would say if your tyres are rated 115 psi like my Gators then run them at 20-25% off or 85-90 psi.

+ 1 Been using them 3 years in all conditions, never flatted.

Bontrager race lite hardcases gave me 2000 with no flats. They last a long time. They ride a bit harsh, especially the 25mm version. But they are availabe in a 32mm. They are very hard to get on the rim.

Conti gatorskins gave me about 1500 miles until the first flat. The gatorskins ride and handle a little bit better. Also lighter and easier to get on the rim. The wear out faster than the Bontragers.

I've since switched to the Serfas Seca. 3500 miles and 4 flats. They ride very nice. Also they are very easy to get on the rim. They're a lot cheaper than either the Bontrager or the Gatorskin tire. They wear about as fast as the Gatorskin.

Have recently mounted Nuteck airless on my main ride. Over 200 miles this week. I like them though they're slower than pneumatics, no doubt. 2 hr rides are 2.25 hr rides, etc. They feel different, but not so much as to make a huge deal out of it. I'm sure the MP is a great tire and very flat resistant. But, if you want to be completely free of the possibility of a flat the airless option is the only way to go. I'm anxious to try them in wet weather. It's been unusually dry here in mid-Tn this spring, so there's been no opportunity. Tons of discourse about the merits or lack thereof re the airless option w/bike guru Sheldon Brown being firmly in the anti-airless camp. If you decide to try them make sure you get ones rated 20 psi above where you normally run your pneumatics and oversized a little. Put 'Nuteck tires' into the commuter search option for more info.

Must... think... in Russian!

+ 1

Schwalbe Marathon +1

...

I'm curious about the comparison between M-Plus and Nimus Armadillos.

I have the 1.5"x26 Army's and am swithching back to them after an unsuccessful winter on 1.25"x26 Serfas Baristas. Although the Baristas are rated at 100lbs, they seem to gash easily, not just puncture. I never had a minor flat on the Army's in two years - just four very major nail/screw type punctures. I'll give them that.

Compared to the Serfas, the Army's feel a little like rolling on cold water hose. Tough, but . . . well, tough. How 'bout the Marathons??

I was a big fan of the Armadillos. Went through two sets without a flat. They are slow but it was worth it. The reason I started looking around for something else is after about 1,500 - 2,000 miles the Armadillos would get side wall separation. Others said that this never happened to them but it did to me - 3 times.

I switched to the Marathon Plus recently. The ride is a lot nicer. It's too early to tell about flat protection or wear.

I'm a big fan of Specialized Flak Jackets(All Condition,Infinity,Nimbus) and Vittoria Randonneurs. No flats with either. I'm on the fence for Conti Town & Countrys. Five flats(2 front,3rear),but after the 3rd rear flat I found 6 other pieces of debris in the tire that didn't get through. Still,zero flats with the other tires under the same conditions.

I heard that the sidewall seperations are from running the armadillos at two low a pressure. Rec. PSI is ~110 for those things, but it's really hard to check by hand if they're low, since the sidewalls are so stiff.
I had only one flat on a set of armadillos, but the ride and traction were so bad, that i was delighted when they finally wore out and i could justify replacing them.

I've run Performance GT2/K on 6 different bikes with 4 different riders. I've put about 6,000 miles on my IRO with them & probably another 6000 to 9000 on the other 5 bikes. We have yet to flat. I spent about 10 minutes picking glass out of the rear tire on the IRO but none of the pieces had penetrated the belt. My fiancee ran over a nail about 3" long which became imbedded in the rear tire. She heard the noise so we stopped. I could barely pull it out without pliers, but no flat.