>1. You cannot bounce off the ceiling when shooting in portrait orientation.
This alone makes it undesirable, almost unusable for general use . SB600 is a much better choice.
I will say "undesirable, almost unusable for general use" are pretty strong words. SB600 is about twice the cost of SB400 and targeting those who want more control over the flash. They serve different level of users and SB400 should not be readily regarded as undesirable/unusable.
For beginners with a light-weight camera+lens setup, they can extend the usability of SB400 by getting a SC-17/28/29 remote cord. In this way, they can start playing with a single off-camera flash (but only up to 1.5m away from camera) by hand-holding it or mounting it on tripod/stand; all without the need to buy SU-800/upgrading to D90/D300 + getting SB-600/800/900.
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