This is a lovely, wooded, solitary trail. However, if you read the trail guide carefully you'll note the words "bog" and "marsh" and "wet spots", which you should interpret as "prime mosquito habitat". We saw another car, but no other hikers. It's marked difficult because it's easy to lose the trail in spots (but it's very well marked with yellow diamonds) and there are some touchy crossings of smooshy wet spots if you try not to get wet and walk on the logs. 3/4 of us had wet feet at least once.
We hiked in on Saturday afternoon, about 10 miles to the river, where there is a very nice camp site, with water and a tolerable number of bugs. We were mobbed for a couple miles a couple of times by bugs. On the way out, a Sunday morning, we experienced little mosquito activity (it was breezy) until the last mile and a half, which was rather heavy - especially intolerable since we were pretty tired by then.
Overall, the four of us decided it was worth it. Solitude, wildlife galore (snakes, toads, frogs, birds, deer, wolves howling), beautiful weather, great campsite. What's a couple of bug bites?
Also, don't forget to check for ticks. I was our tick magnet. I had about eight, the others just had two between the three of them, mostly wood ticks, which are easy to spot.