Do they work, as in telling you what color(s) are most visible at the depth you place the probe ... yes.
Do they work, as in telling you what color(s) the fish are most likely to hit at that depth ... IMHO - not so much.
Just my opinion, based on having & using the original Color-C-lector & Combo-C-lector (in the past) ... for what that's worth.
... cp