The majority of this trail is under the elevated BART Tracks in Albany and El Cerrito. It is a great route for commuting since it goes through so many neighborhoods and its relative length. The trail has beautiful landscaping for the most part. You wont find sweeping bay views that you find on the Bay trail for example. In most places there are seperate paths for bicycles and pedestrians.
In the City of Berkeley, the right of way has a few gaps and it is necessary to ride on streets, particularly near North Berkeley BART.