I found the English keyboard is just right the way it is. The German layout I use on my main device suffers a lot from the fact that we have 4 additional characters that somehow need to find a place. I have to admit that Nokia really found the best possible solution and I couldn't find one single key I would have assigned differently.... but still: It means we have symbols like "," and even letters (!) on blue Fn-combinations. The thing with the arrow keys has already been discussed here... I personally don't find it that bad in practice, but there are situations when you would like "arrow up" to be a key of its own. (Press [Shift]+[Up] when [Up] is [Fn]+[Left]...)

So yes, the size of the keys is OK, they are good to type on, they have a nice rubbery feeling,... but I wish I wouldn't need the [Fn] key so often. Give me more keys. So: Give me a 4th row!