I used to buy them just because of the novel color, and then got some free seed so planted a couple rows, but after I thought about it the "pretty color" was just that, appearance. They're firmer, spicier and drier than a typical carrot, whereas I prefer sweeter and softer. Also they went woody too easily.
I found them to be dry and rather bitter. The Orange ones grown just a few inches away were very tasty.
I even tried cooking the purple ones.
