Ok, I received yesterday my N9 64G from handtec, and until now, no crash at all.

• Firmware version: 10.2011.34-1_PR_001
• Simcard Orange (France) (but was working without at the beginning)
• Developer mode on since few minutes
• One mail (IMAP) account

If I experience crashes, I'll report back, but for now the experience is just perfect. Currently listening to music (put around 25G of music on it this morning, no crash either).