Question about graded Kelloggs cards

Anyone know how they hold up in slabs as far as cracking goes? Are they real tight in the cases? Im just a little skeptical about their longevity, even slabbed.
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Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
Nick
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With cracking a possibility, should one sell immediately?
But there is a risk, and it is greater than zero. Up to you as to whether or not you want to keep them. I personally wouldn't be putting together runs of Kelloggs sets in PSA 10 holders given this risk -- but were I submitting myself, or if it was players I especially followed, I have less of a problem with taking that risk.
Im sure where/how you store them would be important. Cool, dry place? Or at least where they wont have extreme differences in temperature?
I should have also posed the question if they are less likely to crack while being encased. Common sense says yes but looking for people's experience.
Thanks again for everyones input!