We bought our 94' C280 last May (1999) from my cousin in Austin TX. She let us have the car with only 28K miles on the clock at dealer's trade-in price ($18K then). We drove him back (I prefer my C280 as a boy) to Southern California and since then put more than 20K miles including trips to Yellowstone and Grand Canyon.
Problems since then? None. However, I have heard that the cylinder head gasket tends to fail prematurely which causes engine oil leaking (which is a common problem on 93, 94 inline 6 engines). You should be able to find some info by search the archive.
Mine didn't come with CD either. However I managed to put an Alpine 6 CD changer for less then $350. It was a plug-and-play stuff and works well with the stock radio/cassette unit. E-mail me if you need further info about the CD changer.
Harry (94 C280)