I'm writing this review before having thoroughly run the builder through its paces because the deal is about to go away.

I got T4 because I intend to build all my future client landing pages with this.
I'm also going to rebuild my own site on it (from WordPress).

My initial impression is that I'm highly impressed.

What I think is great:

* The UI for fully customizing every element is very easy, assuming you have a basic understanding of CSS.

* The flexibility of populating element text from an external source (such as a headless CMS/database) is amazing.

* The enthusiasm of the dev team and founder is comforting.

* The hosting on CloudFlare Edge makes it an absolutely killer deal.
Right behind the reported speed of the sites, this was my main deciding factor.

* I strongly believe equivalent sites will ALWAYS outperform (in speed) WordPress sites because of how much overhead WP carries.

I will say that I don't think this is ideal for a beginner web developer. It's super easy but you need to have a pretty good understanding of web terminology and structure to take advantage of it.