I have a few sets of piranha's that came on some of my Sig's, while ok I still like the checkered G10's better feel/grip wise. I specify G10 because they have much better grip (in checkered) than wood or plastics. I don't know how to describe the chain-link, larger pattern, more bumpy maybe? They didn't do it for me.
If you are looking for a 1911 you might want to check out VZ, they have a lot of patterns that are nice and some real aggressive ones.