I bought these to use around the workshop with the kids. We do a little more than dabbling, but are not making a lot of real precise things. I realized that these are more for things like drilling holes through studs to run wires and the like, through a fixed feature. They don't leave clean hole and can grab a smaller piece that you are holding by hand. You'll notice the auger point in the middle rather than the knife or chisel-like point that other spade bits have. Again, this product is for drilling quick holes where appearance doesn't matter. This is in line with the comments on Amazon if you check this set out on there. I just finally bought Forstner bits which is what I should have gotten to begin with for our purposes.
So now I have this nearly brand new set. I used maybe only 3 or 4 bits of the set a couple times each and then they sat until I got the Forstner bits. A good deal if they meet your purpose.