So far, I've never been offered anything I wouldn't use. The application we fill out specifies what we can and can't or do and don't use, and I have found the stuff offered to be appropriate to my needs. I have used the Product List several times and gotten several assignments without asking and they were all things we found that fit our needs and I was able to write reviews on them after testing them.
things I wouldn't accept, as we don't use them. Harnesses and pegging stuff, mostly, because we don't Play that way, and it wouldn't get tested. I'd just refuse the assignment, that's allowed. Also, I have allergies and can't use anything with latex in it, so I couldn't accept that either.
In fact our new favorite toy was a spontaneous assignment the JoyDivision The Body
vibrator. Oh.....my......it's quite a fun toy.