Is the CDJ-2000 case metal or plastic?

Plastic. Metal plate underneath. Made in Japan.

Ah, thank you.  It's a little bit disappointing.  I was hoping it would be metal like their mixers.  Does it feel solid as a unit?

The unit is not cheap. I suspect scratches or switches that are plastic are probably cheaper to replace.  The  Play/Pause & Cue, Forward, Back / Search, Tempo, Memory Bank buttons all metal. The buttons on the rest of the unit are solid don't wiggle or anything.  Go look at one. Either way - they pack a lot into one unit. For the cost one should get cases anyway if they had a pair.

For a club environment. They are fine. If you are a traveling DJ you are going to keep them in cases anyway. So that could be Pioneers justification. But yes it does make sense. Probably better to keep them in a case anyway (for the cost) and a case is better than a metal casing on the unit if you ask me.

Good points about the cases.  Thanks all.

Same design the CDJ has always had -- as @mobingzachb said -- plastic on metal.  Quite durable and has stood the test of time since the mid-90's.