I have stood/sat in quite a few of the grandstands that have appeared around the course over that last few years when there is no racing on, and watched the traffic go by to see if they are any good to watch the racing. Most of them are not!
If you watch race footage from this year, you will see a lot of these grandstands are nowhere near full,including the one on the exit from the Creg, and the one at the return lane at the Grandstand. The old veiwing spots like Braddan, Hillbery etc are still packed from very early on.