What This Means
There are 140 sailings in the tier, so it is not short on volume. The issue is value. The best sailing is a 7-night Cabo Overnight, Catalina & Ensenada itinerary on Serenade of the Seas from San Diego, and even that is still an interior guarantee offer for one guest. The top scores are fine, but they do not change the basic shape of the tier.
Compared with the 800-point tier, 600 points gives up cabin flexibility immediately. Compared with 1,200 points, it gives up access to Alaska, Asia, and Australia. That makes it the least useful tier if you are trying to stretch the offer beyond a basic one-guest interior booking.
If you are only trying to get in the door, 600 points works. If you are trying to find the best use of a certificate this month, it is the weakest place to stop.