yes, for the most part, it is indicative of the difficulty.
After you pass the picnic tables, the trail climbs the ridge briefly, traversing the right side of the ridge and goes into a corner between the ridge and the large western slope. The trail then switchbacks to the left up this shady area of oaks and gains the ridge again at approx 3000'. The trail continues to climb the ridge until a flatter region is reached, about 4400'. After 4400', there are two smalls bumps that need to be climbed before reaching 5000'. The second one is the bigger one. The trail reaches 5000', and yet two other bumps need to be climbed before reaching the flat rock. The second one being considerably larger than the rest, though is somewhat more shaded by oak. Note that from 4200' and on, the trail has junipers and large bush, though little shade is still provided. After surmounting four or so bumps along the ridge, you have reached a dried up water fall area, known as the flat rock. The flat rock is at 5900' approx. From the flat rock, the trail steepens considerably, switchbacking up next to this large canyon to the left, and reaches a small rock outcropping at about the 7500' level. This is a good break area. From the rock outcropping, the trail traverses around the right, traversing over several chutes until coffman's crags proper is reached, at about the 8000' level. From there, the trail switchbacks straight up through the forest a small ways (about 1/4 mile) until Long Valley is reach, 8400'. At this point, you would probably be exhausted.
Its about 2 miles from the flat rock to the notch. With 2600' feet gained in those two miles, your looking at an average grade of 4 miles to every 5000 feet, about twice as steep as san gorgonio via vivian creek.
