And if you like Rebol you should. Spry is nowhere near as evolved as Red (which is darn impressive) and Spry is also moving towards Smalltalk more than Rebol.

I also think there is quite a bit of difference in philosophy. Rebol/Red loves adding tons of hardwired datatypes into the language, while Spry is more Lisp/Smalltalkish in minimalism. Also, Rebol shunned OO which Spry doesn't (Red... not so sure).

But shunning OO is popular these days :)