I've had good luck with the madbull 6.03's. 6.01 madbulls seem to be worth the price. I don't think the price for the PDI is really worth it personally. If you have the money to spend, and are willing to possibly not be uber wowed, then get it. Honestly, cost effectiveness is what I like, so my madbull barrels have a special place in my closet lol.