長所
It's the BASIC I grew up learning as an undergraduate - it seems to work flawlessly so far! Perfect for what I've always used BASIC for in the past - to explore a programming idea rapidly, without having to worry about the various complexities that "modern" programming languages - no matter how "simple" they are - impose on program design and implementation.
短所
I'm not sure I see any, except that on MacOS command-S opens the debugger instead of saving.