All the different colours feel similarly stiff, comparable to Gen 2 blue Koosh foams. I couldn't definitively say one colour felt any weaker than the others.
The Gen 3 light greens are significantly different foam-wise to early light greens, which tended to be very thin. Ironically I'd say Gen 3 light greens are probably the thickest of the Gen 3's, as they also have the smallest diameter shaft.
Two of the major issues with previous Koosh batches were excess glue around the tip and insufficient/uncured glue. The latter has been well and truly eliminated, every single tip I checked was very well glued on and couldn't be budged without quite a significant amount of force. The former still occurs, however a lot less frequently than previous batches. In my Gen 2 batch I had to clean up just about every single dart, however in this Gen 3 batch only about 20% of the darts have excess glue around the tip.
Annoyingly the excess glue is harder to remove as it is all cured properly, but I'd rather spend more time per dart cleaning 20% of my darts than spend less time per dart cleaning most of my darts.
I did some quick testing of each colour through a few blasters. Nothing scientific or proper, just a quick test.
TL;DR: less darts have excess glue, glue is cured very well, foams seem reasonable (though no testing has been done on foam quality). Certainly no new issues are introduced with the Gen 3's as far as I can tell.