I was there last year with some friends and had a great time. Went to Barrett Jackson and many of the Casino car shows. That is the 3 rd trip that I have made to it and it is always a great time. I have never felt unsafe and I have attended in 94, 98 and 2013. I heard that around 2000 to 2009 or so that there were some problems with gang bangers. That has since been rectified and now all shows and cruising closes at 10pm each night to deter that activity.
I say go and have a great time and I bet that you will feel completely comfortable and safe the entire time.