I like it. I see it as ostensibly a product for engineers and so when I see a name like S2 it's immediately clear that it's a product led and conceived by engineers.

I also see that on your pricing page -

"We are building the S3 experience for streaming data, and that includes pricing transparency"

Love the simple and earnest copy. One can imagine what an LLM would cook up instead, I find the brevity way preferable.