Mill isn't too crazy from what I've seen, they seem acutely aware of the pitfalls of poor cache utilization and other things which were the bane of VLIW (outside of DSP). The future holds the truth on just how much that awareness translates into performance, but at least they're thinking a bit. The thing which concerns me about the Mill is the software-managed binary incompatibility between every model. They say this is manageable but I have some doubts about it, especially about how it plays with JITs.

They say that JITs will have to link to their proprietary system library in order to work, which seems like it could be devastating for uptake.