The IKEA stuff is great, the only complain I have is the dark enameled inside.
Is harder to get a visual clue about how well are done veggies for example, but other than that it is a workhorse.
I use the Chefmate and LeCreuset stuff (clear enamel inside) to prepare sauces and all sort of darker colored food and had no issues. I should compare them to new pieces though to ensure they are not getting darker, but I would say there is no issue with that.
"Tell me what you eat, and I will tell you what you are" Anthelme Brillat-Savarin