The climb up from the north end (Appalachian Gap) to Ellen is more elevation gain than on the southern end (Lincoln Gap) to Abraham. You get to skip this climb if you do the traditional out and back hike from Lincoln gap. That saves 670 feet. I have done both the out and back and the car spot. They both eat up the same amount of time when the car spots are factored in.
General comments is that the trail is closer to a woods road than a trail for much of its length. There is zero water along the ridge although there can be mud due to poor drainage, bring extra. Think a combination of the Lincoln Woods trail and the lower bondcliff trail except far less elevation. The car spot is long and during leaf season is longer. Unless you travel very early, plan on very slow traffic getting to the trailhead the goal of the state of VT during leaf season is to get the traffic as slow as possible in hopes tourist will stop and buy something
. Car Nav systems tend to default to major state roads making trips even longer, there are major timesavings if you use some of the seasonal roads that go east west but this approach is best done with Delorme Gazeteer. Much of the trail on the ridgeline is in spruce/fir. That's a plus if its windy but the downside there are less views then one would expect. Parking at Lincoln Gap fills up early, you may have to walk a long way uphill to the actual trailhead.
Due to the short days, more than a few folks end up running out of daylight. Its not a bad trail to follow with a headlamp but check your batteries and expect that you may end up encountering folks woefully underequipped including a lack of headlamps or any other way of finding their way after dark except by the light of their cell phone.