They are, but one nb - when they say to roughen the area 'lightly' before application, take it seriously. A heavy hand with the sandpaper and everything goes tits-up.
I have used Halfords glueless patches for the past couple of years without any problems at all.
Like a previous member has said , roughen the tube well and they are absolutely fine
I think they're good as a get you home but after time I have found them to start leaking so I am back on to old school glue and patch kits now. But as a back up in the saddle pouch along with a couple of spare inner tubes they are ideal so I still carry them.
I've got some Park ones lying somewhere, I've never used them though but I bought them as they seemed to be consistently well reviewed where as other seem to be a bit hit and miss (mostly miss).
I've used Park patches and they seem ok - I have had a Park patch where it leaked after a while, but I'm pretty sure that could be explained by over-enthusiastic use of some sandpaper.
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