Yes it's very good. I'm interested in making the small mods to get it to work with NetBSD; but ultimately I'm trying to understand if a lispy environment for STM ARM Cortex-M0 (small) processors can be productively used for real-time embedded systems. I know, I know... I'm more or less thinking an Arduino-like set of standard syscalls for low-level IO, combined with the simple init() and loop() structure ('big loop') for now. Then, multi-threading. Then, the World! (Hello...)