Looks promising. Let's see how it will work in the wild. I find it quite confusing to create or customize blocks directly in Gutenberg because of so many options in the block panel and somehow limited capabilities (I refer to common block builders like Atomic, UAG, Otter, etc.). I hope the team from WP will address most common issues and polish the Gutenberg builder. So far it works pretty good, but I guess it's still behind the competition.