I don't have a Jag, but ignorantly passed on a really nice set-up about 5 years ago. At the time I was only interested in the 2600 and didn't know nearly as much about the Atari scene.
At a small fleamarket I found a Jaguar system w/ hook-ups, 2 controllers, CD unit, memory cartridge, 5 or so cartridge games, and around 5 CD games. The price? $60. I wasn't making the greatest money at the time, and was afraid the CD unit would be dead so I passed.
I thought about it over the week and decided to go see if it was still there the next weekend. The lady said she'd sold it last week. About that time a guy walked up and she told me that he was the one that bought it. He and I talked a little bit and he said that the Jag CD had worked fine. Evidently he has quite a bit of Jag stuff. I wonder if he's ever on these boards?