Personally I think the only advantage electric seats would have over manual ones is the memory function if you have two or more people of different height using the car regularly. Fortunately not a problem for me as my wife is roughly the same height as me I set the seats up and she's happy using them as they are (funny how many people have no idea how to properly set a seat up). I will actually sometimes even adjust the seat a tiny bit according to the thickness of the shoes I am wearing.
Otherwise it's just a lot of weight for not much... I mean how hard is it to just pull a level or turn some small wheel to adjust your seat???