The kawaii keybeds have by far the most accurate grand piano feeling...

fatar keybeds, which are for example used by Nord and Kurzweil, are a bit lighter and next to being good at playing piano, they are also suited for organ style playing with glissandos and such...

Korg, Yamaha, Casio and Roland also produce their own keybeds with various results.

When playing serious piano, the keybed feeling is just as important as the sample and effects quallity in a sample based piano sound..