I recommend trying them before buying them. I ordered a set of Alaska Piks online and found two issues (which other people may or may not experience):

1. They didn't fit well. They require long nails (they won't fit under short nails) and they were incompatible with the particular curvature pattern of my nails. Besides, I bought them so that I wouldn't have to put up with long nails, yet they didn't stay in place without long nails.
2. They're uncomfortable, because you have to wedge them underneath your nails and then pull on your nails.

In the end, I decided that buying Alaska Piks was a mistake.