I want a zoom for travelling, and was set on the 70-200 f/4 IS.
Plan was to add a 1.4x extender for some extra reach.
Will be used on both a 7D and 5DII.

But then i thought about the 70-300. It's a little shorter, but fatter and uglier.
It weighs i think a little less than the combination (70-100 and 1.4x)

Thoughts on this?
Obviously you lose constant aperture, but there are certainly benefits of going the 70-300 as long as image quality is still good!