Experienece in ORM

[birbal]

Have anyone has experience with any PHP based ORM? I would like to know how much complex query it can handle. I am using my own object mapper which uses reflection to get structure of object and make query dynamically but it is probably not full blown as Doctrine or Propel. I keep adding things when needs arises. Though it can handle basic CRUD operations maintaining object tree. but fails in some places like using Aggregate function on joined or simple tables or in non trivial case. in those case i need to write the query manually. Most of the baisc CRUD operations is operating as intenteded. Does Proffesional ORM handle non trivial queries or those are limited to basic opeartions?