I raced my Nosram 4 star combo on the weekend, up against 2 novak 4.5's
exactly the same speed, punch - power, we were nose to tail for 5 mins so I could easily judge the differences between the 2 systems.
the main difference being that the nosram / LRP didn't require a huge fan and air duct to prevent it thermaling. Ive heard lots of stories of the Novaks shutting down if the fan is blocked or broken by track debris, my nosram is barely luke warm after 5 mins, thats without a fan.