Questions about his S3

Hello !

Now that Qiuyuan is released and people have been able to test him, what is your take on his S3? I managed to pull him at S0R1, but I don’t know if I’ll be able to reach his S3, maybe I’ll go for the S1, but how worthwhile is it to pull just for his S1, does the damage is increase or not that much ?

Does his S3 significantly increase his damage, and make him viable as a DPS, or is it better to let him be a support? And that his DPS isn't that good in S3?

Here’s my roster / situation:

• I have Phrolova S1R1 and I have Cantarella S2R1 for the echo skill team.
• And for supports for Qiuyuan, I have Iuno S1R1, Shorekeeper S0R1, and Ciaconna (but without her weapon). So I’m not sure if it’s better to use Shorekeeper instead.

What would you recommend?

Thanks in advance for your advice!