Good but tries to do too much

I landed here since the Gutenberg Query Loop is so limited at actually querying the loop it’s practically useless.

Anyway, in terms of PostX:

Pros

Allows you to filter and display pretty much anything

Cons

Weird approach to inserting the loop, basically multiple blocks which are different layouts of the same block is just bizarre.

Cannot create your own layouts

Cannot nest other blocks [I suspect since it’s likely based on a shortcode generator at it’s core]

Loads of setting you’ll never need, e.g line height etc which should be universal. If you’re using them then you’re building a site in the wrong way.