I did the Nevis buggy. For the height, you can't do higher in Queenstown, hence my choice. I had a great experience, and the DVD and photos were awesome, plus a free t-shirt.
I was dissapointed however by the way they shuffle you through the process. The music goes on loud and you only really talk to the other customers, not the employees. There was no sense on occasion or build up, but then the jump itself does that.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.