so whats the final say on rx8 vs mmm...

[What's_nitro?]

What are the chances CC would make a flame-retardant plastic case for the MMM? I'm not suggesting this as an excuse to make it seem like it's "OK" for them to fail, or as an insult to CC, but as a safety measure. A little poof of smoke/flame is fine, IMO, but it needs to be kept from propagating away from the source. Actually, I think all MFG's of larger ESC's should do this....

Both systems seem to be pretty good. They each have their own place and usage.
But, just from the limited experience I have had with Castle, I really hope to never have to deal with them ever again. And long waits for their turn around times with all kinds of excuses for it.
No thanks.
Just my humble opinion.