If my personal opinion counts for anything: I think Slava is a first-rate compiler hacker working on a pet language. Somebody should snag him ASAP and put him in charge of something more useful; dunno, a tight compiler for an embedded ARM platform for mobiles or something.
The world didn't need "the best forth-dialect" which he created, and still doesn't. It just needs another standards compliant C compiler. Nvidia or Intel should put an end to his fun-mongering and suit that boy up for a nice Lead FOO Architect position :-)
Slava's very smart, but I think that the basic idea of a 'stack based language' is simply not a great one, because keeping track of the stack in your head is a pain in the ass. So I'd say that mahmud is right on. Worth learning for fun, but it just doesn't strike me as practical.
You're thinking of Forth, not Factor- Mr. Pestov seems to want to compete more with high level languages like Python than with C. Factor has garbage collection, and compiles to images [ a la smalltalk ], not really attributes that scream 'embedded' to me.
The world didn't need "the best forth-dialect" which he created, and still doesn't. It just needs another standards compliant C compiler. Nvidia or Intel should put an end to his fun-mongering and suit that boy up for a nice Lead FOO Architect position :-)