The problem is putting them together - once together they are fine - they put them in a steel cage to air them up - a fucking steel cage that would hold alien -
there are vids on the net how to do it right
two deaths here in the last few years - but again that is at put together time
my mechanic at the time (who was no chicken shit by any means) fucking told me he would not do them period - shook his head and walked away