Well, I haven’t created my hybrid kit yet… I am in the process. But I’ll say this, I fell in love with acoustic drums the first time I put my eyes and hands on one as a small child, and I’ll always have an acoustic kit to play on as long as I live. But with eDrums you have volume control – you can play with full expression and motion without pissing off the neighbors. Then you can completely change the kit sounds with a turn of a knob, which is fun, because the moment you hear the new kit sounds, a completely new beat pops into your head and you can jam on it until you turn that knob again. Then you can also sync up with an audio source and jam along with that with perfectly balanced volume. That said, eDrums currently have the hassle of all the wires and the need for a monitor or an amp (or headphones) and they are also smaller in diameter than normal acoustic drums and cymbals. I imagine a hybrid kit will have similar pros and cons as well. Plus a hybrid kit will have the benefit of being able to switch to regular acoustic if the electricity goes out!
I like the fact that Roland and other eDrum manufacturers are shifting towards making their products more like acoustic drums, because that way we drummers get the best of both worlds.