A short pool after Shallow Falls brings you to Suislide, one of the nastiest-looking waterfall/slides/sluices you'll see. Scout from river right (good piton and/or pin potential here). Suislide is a very narrow 25-30 ft slide, consisting of three ledges that form one big falls. River right (against the reportedly undercut wall) is the best line, but getting over there is tricky. A big rock blocks the entrance, requiring you to ferry over to the eddy behind this rock, just at the lip of the falls, with no room to spare. This also makes getting a good launch off the first ledge nearly impossible, since you have room for about one good paddle stroke when you leave the eddy.
A short pool exists below Suislide to recover your breath (and maybe your gear). Looking back up at Suislide and Shallow Falls forms one impressive sight!