Many times for me. It is a true wilderness trip. The river is an easy paddle upstream from Inlet, not a fast current in most places. In mid-summer there may be one section with shallows over gravel near Griffin Rapids (just riffles, not rapids), but easily negotiated. Note that this is a very winding river with many sharp turns, so depending on your paddling skill in such, your time to High Falls is variable, but easily done in a full day up, half day down. You will encounter more beaver dams than you can count and some log jams.
A few years ago a paddler drowned when attempting to cross over a difficult log/debris jam in a narrow deep section. I remember seeing that particular jam a few weeks earlier. He slipped into a slot between two parallel logs into deep water, and even though the current was slight, he was trapped in debris underneath.