The Yelp listing here says this place is closed, but it isn't.
I needed a smog check for my car and stopped by this place. It's a tiny shack in the strip mall on the southeast corner of Rainbow and Flamingo. Before stopping by I printed out a coupon from their web site (smogbusters.com) for a $17.99 smog check. Normally it's about $20. I got there, waited for the car in front of me to finish, then the guy did my smog check. I was done within 10 minutes (and passed). Simple, quick and easy. They do charge an additional $1 if you use your credit card.