I like the short space bar. I touch type and frequently use an alt-key with with my thumb while my fingers are over the home keys. I like it when the left-alt key overlaps the 'C' key. This short space-bar puts the right alt-key in the same relative position for the right thumb. (When the alt key is one position further away from the center, I find it becomes painful to use frequently.)
I agree that the small arrow keys are not as good as a full size set. They are far away from the home keys and not easy to hit accurately (Fitts' Law), even when pivoting the right hand on the base of the palm. Personally, I would sacrifice the large '0' key in trade to get full size arrow keys.
(Now only if phones and calculators/computers would offer the same digit key order as a software option...)
Newcomer. Toshiba gets into the market of mobile workstations and offers a very well-equipped device with the Tecra W50-A-104. Does the well-known competition has to be afraid? We will find out in our review.