I've avoided doing this for a while, as I was giving CrimsonAtari yet another opportunity to rectify some problems that arose with my purchase from him, but it's been over two months since I purchased from him, and I still don't have everything I bought.
On June 12, I sent payment for an Atari Lynx 2, AC adapter, and one cart. He claimed that he had PayPal issues and didn't end up shipping until 12 days later (at the time, I really didn't care, because things happen sometimes, and I wasn't in a hurry to receive the Lynx). When I received it four days later, it wouldn't work with the power adapter that was sent, and when I used batteries, the system powered on automatically (as if someone did a mod on it because of a bad power switch). He said that he had purchased it from ebay and didn't know about the power issue (though he supposedly tested it before sending it to me, so he had to know it powered on automatically), and he said that his wife had mistakenly sent the wrong power adapter with the Lynx. He promised to send the correct power adapter on July 1. On the 11th, I still didn't have the power adapter, so I sent another message, and he responded the same day to say he would send it. On the 24th, I sent another message to see if he had sent it, but I received no response (it appears he hasn't been on AA since July 18). I sent him one more message on August 6 requesting he get back to me ASAP, but still nothing.
I don't think CrimsonAtari intended to be a scammer—he just doesn't seemed organized (or conscientious?) enough to sell on a forum like this. Though I do have a working Lynx from this deal, I do not have the power adapter that was included in the price I paid. It may be a non-issue, since he hasn't been around in a while, but I would not recommend purchasing anything from him.