I have used both the NF 42X and the 15-55X. Shot the 42X in the LV and HV this weekend at Luther. It was good and clear. Seemed to hold point of impact well. Weight is practically the same as a March 40X. Haven't shot it enough yet to be sold on it, but so far it looks good. Darrell Loker was also shooting a 42X at Luther. He finished 2nd in the 2 gun, I was 3rd. Not sure what scope Richard Brensing was using for his win in the 2 gun.