Hi,
I'am a very big fan of long Tech-Trees because I hate it if I have finished all the Techs in the middle of the game.
In the Beta 5.x the Tech Trees was not really long but now, through the specialisation the Trees are shorter than ever before
because its now only the "half" of the whole techs researchable 
The Idea is good that you have to specialize you and can't resaurch all the techs in one game but now you are finished with all the techs after
a "couple" of turns. That reduce the fun extrem I feel so...
BTW hope you understand what I like to say because I'am not really a native english speaker