Nice emu pretty much same as real thing and is pretty neat little app.
Also since its all disk images It took like 30 seconds to install system 7.
Very easy use with drag and drop.
You just drag the disk image you want to mount onto the(emulated) screen and it mounts it.
To toggle settings you just hold down ctrl(control) and use keys like m for magnify, f for full screen and things like that.
Very nice app great work.