SFO bound

I just recieved an email from good old VH conceirge welcoming me to my forthcoming visit next month. Also included was a price list of tours,etc.
A couple of questions 1. Do people use VH to book excursions and are they cheaper than before we land( I did a quick check online and they were about the same or a few dollars more)?
Or do any V-Flyers just book excursions etc , when they get there?
Thanks
Jurgen
A couple of questions 1. Do people use VH to book excursions and are they cheaper than before we land( I did a quick check online and they were about the same or a few dollars more)?

Or do any V-Flyers just book excursions etc , when they get there?
Thanks
Jurgen