Not sure the target market is for this since it's between airports. The Palo Alto to SFO one doesn't really help you get into the city because much of the traffic you'd have to drive through is between SFO and downtown. I guess they couldn't get rights to land somewhere downtown (after a bit of research it actually looks like there are no active heliports in SF except one at UCSF in the Dogpatch. Color me unsurprised.) Maybe this is useful if you are really really rich and want to skip some traffic between South Bay and the airport, but doesn't make much sense to me.
The only thing that is moderately interesting to someone that's not a billionaire are the flights to Napa. At first I thought it was competing with some of the wine tasting buses that drive up and back but they only do 2 flights a week (Friday-Monday). That implies a weekend trip. I guess that make sense.
Overall, seems not super useful. I guess I am not the target demographic.