I've stayed at the Flamingo a few times over the years and the GO pool never disappoints.
ATMOSPHERE: Beautiful tropical atmosphere. The waterfalls and palm trees make for a great paradise vibe. The grotto makes for a good place to relax with some drinks.
MUSIC: For a non-Beach club pool the energy is great. If your looking for a high energy pool with good upbeat music, this pool is worth a try. Weekends have a young party vibe, unlike some other hotel pools(not including beach clubs) that tend to be more low energy or dull.
PRICE: drinks are a bit pricey but what pool in Vegas isn't. Although cheaper drinks would be nice it's expected of most pool bars in Vegas so doesn't affect my score of the pool overall.
All in all, it's a fun pool which I've had good experiences in the various times I've gone.