This is a promising great plugin that takes the WordPress Gutenberg a step forward & makes life much easier & site building more fun. Colors cards are great.
It can be used combined with other good Gutenberg blocks plugins as Spectra & Kadence (not fully).
Since it is based on Gutenberg it is better speed optimized than Elementor.

While I believe it is a great choice to buy, & that I'll build all next sites using it, I also want to mention the cons:

1. It cannot be used offline & when not connected also to Maxiblocks website. I like many times to build offline (fully undistracted) & for me it is a disadvantage.

2. There is no shortcut or easy way to migrate from Elementor to Maxiblocks. I mention it because while preferring it on Elementor, I would like not to renew my Elementor payments & migrate these sites to Maxiblocks.

3. There are still many missing features, however, according to the roadmap we'll see them in the future, while meantime need to use third party solutions or our own coding.

Yet, I believe it is a very good & fun & rich choice to build a new website.

Thanks