I didn't have any problems with mine - lasted for years and eventually perished.
Had to pump them up every couple of weeks or so, more often than butyl, but having those red dust caps told those that knew that you'd just blown a load of money on some red latex!
shame they disappeared , they were the best tubes around .
they went bust after the village where the production was , was badly flooded . the sold it to Michelin , whot did not kept the name .
I remember one particular street winter ride with my mate where this tube ended up being ripped out of the tyre and slung across the road never to be touched again to the tune of more expletives than Billy Connely after a night on the lash