I personally prefer the "traditional" sort of pumpkin carving, where you cut out the openings of the design. That is what my pumpkin patterns are designed for.
So while these gouges are not a must-have for the general pumpkin carver, they do a great job for those who want to scrape away the outer later of pumpkin skin. The scraping is often done at various depths, to create a shaded effect.
But they can be used on "cut-through" patterns like those available on Zombie Pumpkins as well. Rather than do multiple levels of depth, you'd simply scrape away all the areas of the pattern at one equal depth.
This carving technique won't let out as much light as cutting holes all the way through of course. But it has certain useful applications, such as if you were displaying a carved pumpkin in daylight or a brightly lit room (the under-flesh of the pumpkin is lighter than the darker skin you'd be scraping away, so the design is legible).
Pumpkins done with the scrap-away style also last longer before shriveling up, since you're not weakening the structural surface of the pumpkin.
These tools are manufactured by Warren Cutlery (the same company that makes the components of the Pro Carving Tool saw set I sell). Intended for wood sculpting, the laminated steel tips of these gouges are razor sharp and quite strong. If used only on pumpkin and melons, I doubt they would ever dull.
Woodworking gouges are made is many sizes (widths measured in mm, curve measured by a "sweep" number). A professional woodworker may have a massive range of sizes. But to keep the set affordable, I tested many sizes and tried to limit myself to using just 4.
The sizes chosen are just about all you need to scrape away a Zombie Pumpkins pattern. The v-tool has a sharp angle, which is good for creating crisp edge lines. The other 3 gouges are sized progressively larger. Depending on the area of design you're working on, you can pick the smaller one for details, or the widest for removing larger areas of pumpkin skin.