Yes, we did experience obstacles. I wanted to use MySQL for our project and there was no GA Entity Framework implementation when we started. Oracle is way beh

Yes, we did experience obstacles. I wanted to use MySQL for our project and there was no GA Entity Framework implementation when we started. Oracle is way behind the ball on an official driver and their license (GPLv2) is super restrictive. I found `Pomelo.EntityFrameworkCore.MySql` to be a pretty good implementation and started contributing. We ported it to use `MySqlConnector` as a base MySQL driver. Both libraries have matured a lot, are MIT Licensed, optimized for performance, and are now used in production. I think that PostgreSQL has a similar open source story. There's `Npgsql` for a driver and `Npgsql.EntityFrameworkCore.PostgreSQL` for the Entity Framework implementation. It took some work, but I like that Entity Framework Core allows for it's implementations to be done by the Open Source community. In MySQL's case, we've added lots of MySQL-specific optimizations to the Entity Framework implementation after getting feedback from the community. The new open Microsoft development approach here is great.