And they aren't badly emulated. It's a great collection from what I've heard.
It is not. However for the emulation im talking of Sunshine who is the only one that needed some effort. Examples:
-The effect when using the turbo noozle does not fit entirely the screen
-You don't need to clear all the electric goop
-Debug cubes in the 2nd secret level of Bianco Hills are visible
-Opening the map causes massive slowdown
Etc...