Using them on my commuter in New York City, Round trip I go about 46 miles.
Using the 700 x 28 and found them just great. The only flat I have had was a valve tear in the tube. However when I reseated the tire it will not sit properly in one section and I have a "HOP" in
the tire that is a bit annoying. I have taken it off and re-seated it several times but found that it could be because:
a) The wheel is a bit wide for it. Of course this doesn't explain why I have had no issues originally.
b) The tire developed a bit of a give and just will not go back in fully at one spot.

In anycase amy bike shop said it is okay and no fear of danger and they were able to MUSCLE it into it's place and now there is no hop, until I get a flat.

of course it's in the rear so I feel like I'm riding a horse... Hippity HOP Hippity Hop

Rob