It's my first CDX.
I saw a local craigslist ad for a CDX. Earlier today I went to go look at it, it seemed to be in good condition so I bought it.
It came with (2) official 6 button controllers, an original power supply, Sonic CD, Ecco and the 5-in-1 Sega Classics disc. I told him I already had Ecco and Sonic but he insisted I take them anyways, at least the 5-in-1 will be new to me. He also gave me a Power Base Converter too. The back corner of the PBC was cut out so it could fit on the CDX without pushing on the power cord, I was fine with that.
It plays all my cartridges fine, it also plays all my CDs just as well as my Model 2 Sega CD does . It even plays my Jurassic Park disc, which some say is incompatible with the CDX.
The audio out of the AV port is very good, much better than any Model 2 I've heard. It sounds slightly different compared to my Model 1, maybe less bass?
I'm very happy with it. I think I'm going to pack away my Model 1 Genesis, and Model 2 Sega CD. It takes up hardly any space! But, do people leave the 32X plugged into it? I thought I read somewhere that without that 32X adapter/insert Sega never released the weight of the 32X could damage/loosen the cartridge port.
My ONLY disappointment is that the headphone jack sounds nowhere near as good as the headphone jack on my Model 1. I really wish the audio out of the headphone jack sounded better because then I'd have no complaints.