Speaking from (independent) experience, the SiTime parts live up to the hype.
You do not want to be in the quartz crystal business going forward; it's almost as dead as vacuum tubes, even if the manufacturers don't know it yet. Nothing will be left to fight over but the very cheapest commodity parts.
It's pretty nuts - if you care at all about your frequency reference and have power or space constraints, SiTime seems to be beating everyone else right now.
You do not want to be in the quartz crystal business going forward; it's almost as dead as vacuum tubes, even if the manufacturers don't know it yet. Nothing will be left to fight over but the very cheapest commodity parts.