Perhaps, but probably too slow for 680x0 hardware I tried it a few years ago and it was too slow for even a simple 'Hello world!' program
For 68030, Dice is quite usable speed wise, and perhaps SAS6.58 (which is probably much better than Dice).
Indeed, these are absolutely fantastic for learning 680x0 assembly language.
VBCC is ok my 060 but you are right about SAS/C being better on slower CPU's. I recently spent a few hours modifying a small tool of mine that compiled with both GCC and VBCC with no problems to compile with SAS/C and it was a real PITA because it doesn't have much in the way of C99 support and I'm lazy.
@OP
I can send you a fully patched copy of SAS/C 6.58 or 7.01 if you PM me your email address. In fact I can send you pretty much any dev tool you fancy as I have most things knocking around my machines.