I have used the Fanvision for a few years and would never go to another Grand Prix without one ! I have booked to collect mine in Monaco this year. I have used them at Silverstone and also in Montreal last year. Their people are alway shelpful and polite, and the service is good too. I have always booked direct.
it is like having Sky Sports on your lap. If you are in a Grandstand, you will find lots of people asking you what is going on as the race unfolds.
When the race was stopped in Montreal, I was the only person in the stand who knew what was happening !!