Reply to hmmm VCI 100

So i was about to buy a Numark Stealth Control for $150. However, then a local DJ gave me an offer on his new VCI-100 of about $215. He's a Serato DJ so he said he changed his mind about the controller while it was on the way to his house. But, I really want the new firmware and arcade buttons. So should I take the offer, buy an overlay and the new firmware? And then eventually do the arcade mod myself. Will the DJTT mappings work with it? Or should I stay with the Numark Stealth Control?

Please someone give me an answer