You remember right, they used to have their own rendering engine and lota of neat featurs like lightning-fast notes and and even email client. Around 2013 this

You remember right, they used to have their own rendering engine and lota of neat featurs like lightning-fast notes and and even email client. Around 2013 this all disappeared - they switched to Chromium's engine, and dropping all of their special features. Opera 15 was super-generic chromium fork. This was when I've stopped using it.