I'm happy with my Inka. Form-factor means it's always with me, and expanded it's large enough for significant use without too much discomfort. I haven't had any problems with it not writing instantly. My "bullet" space pen, in contrast, I find uncomfortable for more than small amounts of writing, and usually but not always starts writing immediately. I don't think I've used it since I got the Inka.

Having said that, I have a load of Pilot G2s for work and anywhere else I actually expect to be writing.

eeph