Ultegra di2 St,Rd,fd weights 295 250 155 Da Di2,237, 217,114
"On our scale, the shifters are 57g heavier, the front derailleur is 43g heavier, and the rear derailleur is 49g heavier."
Sounds about right. The "big" difference in groupset weights is down to savings on brakes, cranks etc as well. All the other di2 parts are the same between the two as well.
So 150g hardly worth it. That's only 150ml water.
@hippy started
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Ultegra di2 St,Rd,fd weights 295 250 155
Da Di2,237, 217,114