This set of food colors comes in four little tubes, with the product consistency somewhat like a gel toothpaste. It dispenses easily and mixes through frostings/icings very well. I selected this set after discovering the Wilton brand is processed in a facility that processes several allergens (peanuts, tree nuts, fish, shellfish, milk, soy, and wheat). Fish and shellfish were especially surprising to find on the list. For those with severe allergies, the Betty Crocker gel set might be a better idea.
The greatest benefit to using this set is that it does not thin mixtures out at all, due to it being much more like a gel than other food colorings, like Wilton and Duff. This can be handy for recipes like Swiss Meringue buttercream or Whipped Cream frosting, or if you have a regular buttercream that is less stable. And because it is solid, you tend to "lose" less of the colorant to your bowl, spatula, whipping tines or whatever you use for mixing.
But there are two downsides to using this food coloring. The first is because it comes out more like a solid than a liquid, if you should ever wish to attempt to replicate a color, it is more difficult to measure than it would be to measure a liquid, as the amount you dispense at any given time also depends on how hard you squeeze the tube. Let's say you want to color 1 cup of frosting yellow. So, using a more liquid gel color, you get just the shade you want using two drops. Next time, all you have to do is use two drops per cup to get essentially the same shade. That ability is lost with these colorants. You can perhaps measure the length of the segment you used, but the thickness may vary, making it more difficult to re-create certain shades.
The other downside is that these colors are not as concentrated as liquid gel food colors, meaning it requires much more of these colors to achieve brighter or bolder shades. It works very nicely for soft pastel colors, though. But these colors have the same problem that your average non-gel liquid food color set has: getting certain shades like a good purple, true red, and black are near impossible. I have not yet attempted to make red or black using a chocolate base and these colors yet.
Overall, it's a good product for basic colors, and handy in that it's easy to find in some grocery stores. For severe food allergies it can be helpful as well. It's worth giving a try.