Having the N810 for nine months now, I recently started playing with the handwriting on the N810 as I have a Nokia 5800 sice May with rather good HW recognotion.
So I compared both and came to the following conclusions:

- 5800 is faster than 5800 you can write with almost the same speed as with pen and paper. With N810 you have to write slower. But on the other hand, the N810 does not require you to switch between digits and letters (a letter 'O' is a circle and a '0' zero a slashed circle) and the N810 does not aotomaticaaly change case which is convenient: on the 5800 in some cases when you clearly write a lowercase "a", it 'strtoupper's it to an "A" and in other cases the other way areound. Defining shortcuts is also easier on the N810, e.g. a simple gesture for www. or .com.
My conclusion is that the HW recognition of the N810 is good but you have to write slowly and the writing pad is a little bit too small and inserting characters into existing texts is also not easy. Furthermore you have to write letters not too far right from the previois one otherwise it introduces a space.

What are your experiences ?