I got two rides in on my two days at EU.
The first ride I waited 3 hours with a posted 135-150 min wait. It was definitely not worth the wait. The queue is impressive but if you're stuck there for hours, the amazing queue seems to wear itself very thin. The line basically never ends.
The second ride, I caught it during that lull between the morning rush and the evening rush and waited 90 mins with a posted 2 hour wait. It was much better that time.
I love how large this ride feels. Uni definitely took full advantage of the show building. Sometimes you feel like you're climbing up 5-10 stories at a given time. The drops aren't as intense as I expected, but there was 1 or 2 pretty good pops. The animatronics are very impressive, namely the death eater. Unfortunately I feel like the ride is rather screen heavy. I didn't really care too much for the story. I was just in it for a good time.
Its a great ride, just don't wait more than 2 hours for it.