I think the key to electric razors, is that you have to be prepared to drop the big bucks on a quality one. By that, I mean dropping $300+ on one, something that I haven't been able to bring myself to do, even though I might actually save money in the long term. I have tried some of the sub-$100 electrics and found them to be huge disapointments
I've got a few good ones - a Philips one (rotary style heads on it) and a Panasonic with foil/cutter type heads. The Philips was rubbish, worst $500 I ever spent, and the Panasonic was better, but ultimately the BIC disposable razors do a better job, much more quickly.
Both the electric ones don't shave very closely - leaving you with that shadow look.