Generally, its an OK attraction. Just watch the reaction from people who havent been on it and you see it scares the hell out of people. But, as with all things Towers, it could be so much better. The opening video for example about the Nemesis creature could be changed to make it less, erm, unbelievable, pinning down an alien with rollercoaster track for example lol.
Then the bottom of the lifts with the eggs, would have been better if some sort of animated creature was facing each lift, and at the bottom, the head looks from left to right with glowing eyes, maybe spraying some light water across the riders. As for the ending, it was far better with the actors in there, but without them its just dull and bare. The end needs some serious consideration.