I've looked into it a bit. I'm getting to the point where I either want to use a full ORM, or I want to write raw SQL and have it checked against the database.
Query builders are nice, but they sometimes end up in this middle ground where they have the worst parts of an ORM (needing to learn a new syntax and not getting access to all the DB features) and the worst parts of raw SQL (Unpacking relationships into objects w/ pointers is error prone boilerplate that sucks to write).
I love SqlAlchemy since it's still enough of an ORM to solve the main problem I want solved. Super curious to hear if you've had good experiences with Keysley and how it deals with transforming relationships into objects