Sitting up on the second level of a semi-modern train was comfortable. The view of backyards and behind commercial buildings wasn't awe-inspiring, but the stations, many nicely restored, were moderately clean. Signage was excellent. Shuttles and buses were waiting at many stations. Several people with bicycles would get on or off at each station.
Many stations have bicycle storage.
Free shuttles are available at the Santa Clara station for the San Jose Airport and at the Millbrae station for the San Francisco Airport. It's only a few blocks walk to Moscone Center, and even closer to the new PacBell Park. Unfortunately, I did not sit next to a lovely woman on the way back. Instead, I sat next to a 300-pound man who was eating from a large bag of fast food. I'd do it again.