I haven't used typeorm for any real world projet yet. Although when I tried using the mongo driver, literally nothing worked. I also ran into problems from the generated migrations where I would get errors when trying to run them.

Even with these encountered problems, I'm still willing to give it a try for my upcoming project. I'll probably write an article on this if things go bad.

For sure, this is less mature then the others out there, but I think it has a bright future as it has a nice syntax and cool features.