KLHZYT ZHKLA? -> KGHJK!

Yes, we (me and a friend) have used this compiler for a school project with a 89C52-single-chip (robot stepper motor controller). The code is really very good, all interrupts have been written in C, still it was only 5 kB.
Originally our teacher wanted us to use a freeware assembler and we had 1 week, but in C we needed only 2 days and because of the floating point, it is much more precise.
That's how we like it: 3 days spare time and a good examination note.