Nothing wrong with used SSDs (aka. "refurbs").
It'll likely arrive with the latest firmware installed, but do check online and update it if needed before using it.

I have a couple of re-purchased Crucial M4 128GB SSDs around here, and they're every bit as good as the "new" one we have.

The wear-out life of these things is vast, so that part doesn't concern me in the slightest.

Cheers