I've been using Park patches for several years; I'm just coming to the end of a job lot I bought about 13 years ago when a LBS closed down. Very rare that I've had a problem with them though. Maybe I'm just lucky. I still use rubber solution & patches though; depends where the hole on the tube is. The rubber solution is at least five years old and still okay - used it today, although there isn't much left - ! The patches I DO avoid are Leeches,as they aren't much good for tyres running at much over 50 - 60 psi.