The latest ESNUG newsletter contains an entry by an anonymous user from an anonymous company with high praise for RealTime Designer. They had run out of steam with DC getting big blocks synthesized, got up and running within a couple of hours and compiled their largest 5.8M instance block in 70 minutes in less than 2G of memory. You have to like the closing sentence though:

“Overall I think Oasys has strong potential to replace Design Compiler.”