It seems like the quality has gone up, too. Our last several boxes have been all hits, no misses, where 18 months ago there's always be at least one miss.
That said, we're slowly building a repertoire from our favorites, and with that knowledge combined with which "special" or "rare"* ingredients can be reused/replaced, we'll probably eventually stop using the service. But that date gets pushed into the future more to the extent they keep quality high.
*I know they're not "rare" to foodies, but we're pretty basic grocery shoppers.