This was a great experience and worth driving off The Strip for (or take their shuttle from the Excalibur). If you're going in the summer, I recommend the 9am flight time; anything after that might be too hot.
The van does most of the leg work to get you to the top but there is a bit of "hiking" to do once they dump you out. You also have to carry one piece of equipment with you; an awkward 15 pounds. That could make the hike more difficult than it needed to be but the guides were great about caring mine for me. I guess I make a good damsel in distress.
I don't like roller coasters, but I don't mind the heights so this was a perfect activity for me. The only scary part was the anxiety I gave myself watching the first group go ahead of me. The flights don't feel as fast as they look (which could be a negative point to some, I suppose). The flights are relaxing as you are comfortably strapped in - no stomach dropping feeling at all. Without getting caught up in doing the misnamed positions they make you do, try to take in as much of the scenery as possible.
All four lines were great, though I did get stuck about 25 feet out on the third run. The bonus ride in was a nice addition [one of the guides had to shimmy out and wrangle me back in]. Everyone was right about the staff. The three guides/guys we had (Hudson, Dave, and Kyle) were fantastic. Tip them well.
Well that's my report for now - if I think of something more clever or witty I'll add it on. Check out a few of the photos I added as well.