I bought two helmets to try out: one the Rudy project and the other was from Scott. I tested them both back to back and found that the Rudy project fits better and has better ventilation and is 1 ounce lighter than the ARX from Scott. Both function very well, but the Rudy project is just a touch better on fit and finish.
Coming from a road helmet, this one was fantastic! They were able to get it to me before a 70.3 despite having some warehouse issues. So, not only am I happy with the product, customer service is also great!