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nah. Typically when doing heavy lifting, you accelerate flights with fuel, so the speed is irrelevant. If you really want faster planes, S3s are better than S1/S2 and you get them by flying regular planes. S1/S2 are not very useful

I don't use them, but I don't think they are very useful - UNLESS you have CBM.

It's definitely THE way to spend tokens, if you don't have other ways of getting greens.

Nothing else comes to my mind. For most people, getting greens is the top priority so even if there was something else, it wouldn't matter until you get CBM.