I had a play with NS Black Hole Big Pop in Korea recently and yes i have to agree felt like a max PE6 rod, although I am told you can put considerable hurt on a PE6 rod, I myself haven't had enough experience with the lighter sticks to confidently tell you.
I have the JM Monster GT 78 and the only issues i've had is working smaller stickbaits, not tippy enough for it - feels like a great PE8 rod though plenty of grunt too.