Great service! They're always fast, courteous (above all else) and very clean. I've been to a number of these places the last fifteen or so years I've lived in Las Vegas and most of them are a pretty bad experience. Some of the little shacks literally have a mattress in the back where a guy sleeps with trash and other debris strewn about. In other cases, the service is usually rude or just indifferent - yet way more expensive (up to $30 in my experience). After reading the Yelp reviews for this place I had to try it and I was definitely not disappointed. I've gone back twice and have a third car in need of emissions very soon. I highly recommend Go-Green Smog and recommend it to everyone else. I don't know why I've ever gone elsewhere!