For me, when it comes to learning a new skill, it has always been easier to learn by doing rather than reading about it in a book. So thats why when I was trying to learn about Cisco networks owning my own cisco ccna network simulator was a real benefit. But the cost of a new one, for strictly training purposes, was really out of the question. That is why shopping around online for a used one was a much better option for me. It is much cheaper than a new one and did the job for me.