I love my Screwdriver, but I'm finding I prefer a less obvious device for out-and-about, so I'm using a mega kr808D-1 batt (bought from Heaven Gifts for $12) with 510 cartos or 510 mega carts. I've been very happy with the battery life of this kr808D-1 so far. Aside from not needing an adapter, tell me why I'd prefer a tornado/ego. IOW, should I buy extra kr8 megas, or do I NEED a tornado/ego?
