"Most readers of this blog will know I spent years at Percona. I know what they've changed in Percona Server and why, and we don't need those changes." Can you

"Most readers of this blog will know I spent years at Percona. I know what they've changed in Percona Server and why, and we don't need those changes." Can you go further into why you choose not to use Percona? I was under the impression it was mainly just MySql tweaked to perform slightly better? Are you using Percona's XtraBackup? If not, why?