Delicious and a great deal (around 12 or so bucks). We added an extra shot to it and it was a great way to start off our Vegas stay.
The bartender said to avoid the red bull flavor as it tastes like a**. When I tried it, I downplayed the flavor as I didn't want to look like I absolutely loved it :P Ultimately, I opted for the pink lemonade and for whatever reason, it masked the taste of alcohol but still delivered the effects. Ask for samples before you commit to something.
This is a great alternative if you can't make your way out to Fat Tuesday (we were staying at Treasure Island so the Venetian wasn't too far away).