Konad is the one brand that started the whole stamping nail trend, since then stamping has come a long way. More brands, different types of stampers and no you don't need Konad polish to stamp your nails. When I started stamping you were told you had to use Konad stamping polish only to stamp your nails. Also Konad is kind of expensive compared to other brands that are out there. For myself once I discovered other brands I stopped getting Konad. The reason for this, the price yes. The individual images are cute, but the full nail images were too small to cover all 10 nails. Had to "double stamp" the image on middle and thumb nail. And that takes skills to line up the images. Also when I started there was only 1 kind of firmness on stamper, and it was too firm for my deeply curved nails. So I ended up smudging the image on my nails.
If you have wide nail beds I wouldn't go with Konad. These days there are other brands that have bigger sized full nail images and the plates have more images on them or they come in a bundle for a good price. To mention some Bundle Monster, Pueen, MoYou, Dashica/Infinity Nails, Marianne Nails, Uber Chic, Messy Mansion.