I did have liners in my tires for a while. Not sure what brand, something cheap from the cheap LBS. They gave me more flats than the regular patches of glass on the road so I gave up and took them out. I think the problem was they were too wide for my tire. When I took them out, I noticed the liners had cracked in several places causing pinching punctures in my tubes. I went from having an average of a puncture a day with the liners to having just four punctures in 6 months without them..... and I ride my stock tires in all kinds of conditions....