Out of seven I've used (from the first full production run and initial V2 production), only 2 have cracked to a point where leaking was an issue. That however, was only after weeks of repeated heavy use.
These things last longer than any "disposable" product has a right to. Even some that I thought were well past their time came back to a very acceptable level with heavy dry-burning (which, I might add, other products would most likely not have been able to withstand.
No other product I've used even comes close to the performance, consistency, and longevity of Stardusts.