This was one of the hardest hikes I've done. The trail is very steep, and its really rough...Lots of roots, rocks, mud, streams and some parts where it goes straight up the side of the mountain. But that said, it also immediately became one of my favorite hikes ever.
The road in, as everybody else noted, is rough in spots. Mostly its in good shape with some potholes, but there are two creek crossings where you'll appreciate a high clearance vehicle and there was on puddle on the road that was at least 4 inches deep by about 10 feet long. Probably want to leave the minivan at home for this one.
The trail was very wet. Very very wet, as in parts of it are literally a stream bed. There are a lot of roots, and its rare to find what you think of as a regular trail surface. Between the roots and rocks, its rough going. It will take you longer than you think to do the three miles to the top. Theres one or two spots where you have to pay attention so as not to lose the trail, but for an unmaintained trail its pretty easy to follow. Also, it looks as if somebody came up this year at some point and cut a bunch of fallen logs and some brush away, thanks to whoever that was.
Heres the pay off though...The views are amazing. At about 1 to 1 1/2 miles in, you cross an old slide area...The view out over the valley will stop you in your tracks. It was very misty under a clear bright sky when I started, watching the fog play over the shoulders of the mountains was amazing. The trail goes through what was old growth at one time, there are some stumps and a few surviving trees that are a treat to see. I also like that the trail starts in almost a rain forest, then works through several types of forest until it ends in an Alpine environment. The pass is a reward in itself, a weird environment of rocks, trees, brush, and moss...I got a quick shot out towards Three Fingers when I got there, but in about 5 minutes the fog blew in and it started hailing! A good reminder of how fast a mountain can change its mind about being nice to you! Always bring gear for all weather you might encounter...I came down the hill in a light rain, which has its own beauty.
Big plus: You will probably have this hike to yourself. I didn't see so much as a boot track, literally. I must have been the first one up there in at least three or four days, if not longer. You want solitude, this trail is a good bet!