I'd say it's worth it if you're boating primarily over 250 and there's nothing else running. Over 300 will make the entire float a whole lot more tolerable (maybe even fun), but that mank section will be full-on Beefcake Brutus - save some time from scouting that.
Some photos are located at Alex Henes - Merely A Flesh Wound
Paddling > Stills > Arkansas > Grape Creek
As reference, the level was about 120 and that was TOO LOW. That sweet shot of Gary launching the curling drop does not show him landing on the rock fin from 5 feet up, bouncing sideways and flipping above the sieve (he rolled). The Mank section is sieve central and there will be lots of hidden dangers. Maybe it'll be filled in and smooth, but there's still a lot of undercuts and rib-rippers lurking.
That all being said, I'm giving Sunday some serious thought.....