However, this keyboard will most likely be used with thumbs only, and not flat on a desk with 10-finger typing. For thumb-typing, larger keys/larger keyboards means more distance to cover with the thumbs, and I don't know what is the optimum size considering variation among people's hands, but seeing that I was more comfortable typing on the N900 than the TOHKBD and mistyped keys more often with the latter, I believe it's not huge.