I'm no expert on the CD-playing specs, but I can tell you the CLD-S104 was a bottom-end Pioneer model with sub-par video quality. The signal-to-noise ratio spec on the video for this model tells you the picture quality was rather noisy as compared to the middle-end and high-end models from Pioneer. Not saying don't get it and use it -- just don't pay too much for it or expect too much.
I still have and use three middle-end players that, thank goodness, are in good working order to play my 1,000 or so big discs. Just a few years ago I acquired 500 or 600 LDs that, amazingly, duplicated few of the ones I already had and few of my larger DVD and fledgling Blu-ray collections.
I do play CDs on a Blu-ray player, but somehow I just never played many on my LD players over the years. I'm sure they're fine for it.