I've seen this and I really like it.

I think the UI is great, and love the overall direction of the product.

I know this will be hard to hear, but I want to provide my best feedback.

As a CTO, I will rarely, if ever, use a product like this that's not (at a minimum) open core.

I just can't risk building technical and business momentum around a startup that I don't know the longevity of.

I have no problem paying for software, it's business continuity that I'm concerned with.

For a great example of how to do this, I recommend checking out Mattermost. Also cal.com.

Those are two products I've selected for use in our tech stack.