IIRC I believe tailspin was based partly off the Narcissus codebase. I think MetaES is better because it gives you a debugger whereas Narcissus isn't pausable (

IIRC I believe tailspin was based partly off the Narcissus codebase. I think MetaES is better because it gives you a debugger whereas Narcissus isn't pausable (last I checked). Additionally MetaES is written in plain ES5, which I think is another plus over Narcissus in terms of general usability. Narcissus' focus was mainly on prototyping language features and I get the impression that compatibility was never a concern.