SQL Express Limitations for RMAD version 10

I have no SQL licensed version in my infrastructure. I am planning to deploy RMAD version 10.

I read the product guide and understand that RMAD itself provides SQL express for storing database and reporting purpose.

My NTDS database size nearly 15 GB if in case any AD restoration wants to perform does SQL express support ? Is there any limitations available in SQL express.

let me know the drawbacks and advantages of using SQL express for RMAD.