I had bad luck with glueless patches them when they first came and avoided for years until I ran out of 'real' patches and spare tubes a few months ago and was forced to use one from a free Giant patch kit Arrow Bikes of Hyattsville, Maryland gave me at Bike-to-Work day two years ago. The patch held fine and is still holding. Rema Tip Top is still my patch kit of choice, but I no longer shun the glueless patches or consider them a temporary repair. I know a messenger/cat 1 racer who's been using them for years and swears by the square Park glueless patches.