I know this is an old topic but thought I would share my two cents.
I was at the most recent Singapore GP, first time there. I was sat in the Bay Grandstand, cost was a factor I will admit but I also read a review that was actually pretty hopeful for it.
Having been there I will 100% be sitting in this Grandstand again next year when I plan on returning. The view you get of the bay is next to none and on this section of the track there was no shortage of action. Passes, people braking too late and running off, colliding with the wall before the tunnel, the SOUND of the V8′s through the tunnel. It was just a fantastic experience. It’s a shame that you don’t get as much of a view on the straight but besides the Pit Straight Grandstand I don’t think there are many other places where you can get more decent “on track” time here as cars just shoot-by at speed through others and you get two huge screens and loud speakers so you always know what is going on during the race. At least at Bay you get decent acceleration and braking action here. If this wasn’t good enough the fireworks display is fantastic here. I’ve got a video of it on youtube here: http://www.youtube.com/watch?v=ctQwszwgkG8.
The only downside I had with this was the fact that you don’t get access to the F1 Village. So next year I’d get a walkabout roving ticket as well as a Bay Grandstand ticket so that I could access Zone 1 over the weekend. For the early bird price of only £114 for a 3 day ticket for the Grandstand getting a walkabout ticket will be no big deal!