It's a shame that did such a lousy job with the emulation. It's one thing to be inaccurate and fast or accurate and slow, but making a slow and inaccurate emulator for the Genesis in 2017 is super lame.
Monetizing 20 years old games is already easy money, they could at least do it as well as people doing it on their free time...
So yeah for once the paid version was as good as a passion driven fan version.