In 2009 I attempted to do the full Marathon but due to injury I waddled thru the half. Last year I was given an entry and vip access for the Half.
I love Las Vegas I lived out there for a few months in 2005, and have friends a little over an hour away.
I wouldn't recommend running the full Marathon because the race starts at 4pm, the course is dark , and there is very little scenery or crowd support.
The Half however is a different story. It starts at 4pm in November. Which for the most part is great running weather. I will say a 4pm start is hard. You don't go to bed early the night before, and you don't want to do too much during the day but you don't want to sit around either.
The first six miles is on the strip with ample crowd support and well lite, and a fantastic view. Miles 8 and 9 are really dark because you are in a residential part between the stripe and downtown las vegas.
The medal is awesome it glows in the dark. I gave my shirt away so I don't remember what it looks like.
The expo was great. I was in the vip area. but the regular expo had a volcano and a giant shoe you could ride.
Vip access which you can up grade to when you register might be worth it. You get a better start corral. There are free massages and champagne when you pick up your packet, as well as a no wait area.
Then at the start there was a tent with food, water, and massages and right at the finish there was a party with anything you could want to eat and drinks.