I am a big fan of "green slime" puncture resist inner tubes, but my son seems to be having frequent punctures with these supposedly "auto repair" inner tubes, 1 today on our drive and one very recently on the high peak trail. Not sure how other people have got on with them. we are going to buy puncture resist tyres.
I'm sorry to read that you are not satisfied with these innertubes. They are designed to be resistant to small punctures from thorns for example and the trick is to keep cycling when you feel a flat coming on and to maintaining correct tyre pressure for the rider's weight before each ride. You are correct in saying that the first barrier to reduce the risk of punctures is the tyre which in reality is the most important element of the two to keep the dreaded puncture fairy at bay.
Peter Lazarus, National Cycling Manager, DECATHLON