This is going to be an interesting event for me then when my K3 (sorry,my -wife's- K3) arrives.
I work with typesetting languages such as LaTeX a lot and they do a very nice job with full justification without being silly, but the whole TeX system is so delightfully tuned that almost everything comes out beautiful.
One would think that however with e-readers and their significantly lower resolution it may well be a futile task beyond a certain font pt size.
Just checked on my Linux eBook reader with my wife's publication, seems at the default fonts/screen-size full justification appears acceptable.
Paul
http://elitadaniels.com