ive been playing dooku a long time, 2015 start account, dooku one of my first couple characters to 7 star and until his update has always been on my sith team.
after the update due to a couple of zetas i was saving for i didnt train his new omega immediately... when i did though i must say it is noticable how much LESS damage he gets to contribute due to hiding in stealth after using the new omega ability. it was a detrimental upgrade. havent done the math but it was a pretty obvious change. no clue however as to how much survivability the stealth brings to the table really as it didnt seem to make a huge difference outside of without doubt reducing his counter attack opportunities.
all together...i regret training the new omega finally, and would not train it if given the opportunity to do it over.