Had a convo with a customer this morning that I didnt quite like.  I feel whether you ride street/dirt, 2/4 wheels, XC/MX you're alright in my book either way.  I was told this morning that quads are for female genitalia.  WOW, i could have snapped but i simply told the customer that its a total different game.  He continued to tell me that you dont have to balance a quad, you get to sit down all day, and that anyone can do it.  I must admit i am partial to Quad XC.  I've done all 4, Quad MX/XC and  Bike MX/XC.  I hate to say it but he is the typical bike MX dad living in his son's glory.  Quad XC guys/girls are by far the most anxious to help out with anything you might need parts, tools, or just advice on riding style.  Just my 2cents.