Reply to Gemini ps 525 + cdj-20s for scratch practice?

Found a guy selling a gemini ps 525 pro mixer and two gemini cdj-20s In a case wired up for $150.

I already use traktor and a hercules steel controller, but am interested in this as a practice tool to scratch and work on my beatmatching skills as I have never had the opportunity to learn on turntables or cdjs.

So should I buy it?