Anyone been to the Singapore F1, or going?

[Lexual]

I'm looking to go to the Singapore F1 this September and checking the different tickets available, at the moment I'm leaning towards just the 3-day Premier Walkabout tickets that seem to give general access to Zones 1,2,3,4.. for around £300...

Has anyone been in recent years and can recommend if this is a good buy?

Any recommendations of a reliable website to actually buy the tickets?

TIA.

Ollie.