I tried using glueless patches about 7 years ago. My success rate with them was pretty low (like 60%?) Most of the time they'd slow down the leak rate and get me home, but would not be a permanent fix. Seem to recall the Performance brand glueless patches work better than the Park brand. Again, this was 7 years ago though.

Ironically, I was getting the best results with those generic non-feathered patch kits one can get at Longs Drug, Orchard Supply, Walmart, etc. They were coming in square or rectangular shapes one could cut to size. The rubber was usually a little thicker. My success rate with these was very near 100%, and I had patched at least 30 holes with them. 15 years ago, as a teenager, I remember having 5-7 of these patches on a tube and the tube would still hold air! (so I was getting a lot of flats due to cheap tires) Those patch kits went a long ways.

In recent years I just use new tubes (less risky) though more recently been more consciencious about being wasteful etc. so have tried to patch some. Started using the Performance brand patch kits (with glue and feathered patches) and they seem to work all right.