To each their own, but...
I didn't care for the Ultrasmoke all that much, but I love the ET. One of the big reasons is it's such a good interactive tool for all your magic (meaning that although it still needs to be used conservatively in performance [you don't want the only thing your audience remembers is you shocking the hell out of them for 10 minutes and them being afraid to touch you], it's very diverse). Your specs FEEL the coin bend in their hand, the card change, the thought transfer, the spongeball jump, etc.. And, in my opinion, anytime you can take your audience from observers to participants in your magic, it's a good thing.
Very cool gimmick. Very well made too.