I am currently at the Mungindi CP and it seems nice enough. Small and welcoming. Although we arrived a bit late last night and haven't really had the chance to check it out.

This may not be of interest to the OP, but we came the direct route from Collarenabri to Mungindi yesterday. It's signposted as a dry weather only road. It's mostly sealed, but there's about 20-30kms of dirt in the middle, whcih is in reasonable put not perfect condition, and we were able to mostly scoot along at 80-90kph. The bitumen south of the dirt is very good. The northern section is ok, but there is some roadwork. It's not a bad road if you don't mind a bit of dirt, but I would definitely not use it in the wet, and there is rain coming this weekend.