Sorry to say, I've been to a few f1 races at Silverstone and the pirelli era has made the races a bit of a waste of time, you end up watching it on the big TV in front of you . The cars just drone around in the foreground.
I think pit straight grandstands are a good idea because you get to see the drivers on the grid , track parade and a few other things that go on.
At Silverstone, the view into the pits is terrible, the seats are very expensive and the facilities dire.
During the Brazil to I followed a few chaps on periscope and the view on the pit straight looked awesome, really close to the track with cars hurtling by at 200mph, a bit like the old bridge at Silverstone. The grandstands are proper concrete ones with decent facilities underneath just for those in the grandstands.