A good friend of mine went Inadvertant IMC in an R-44. He was a talented CFII and his student was also a rated helicopter pilot. They both died. Here is the link to the NTSB reports:
http://www.ntsb.gov/ntsb/brief.asp?e...30X00889&key=1
You do not want to go IMC in any helicopter without SAS or autopilot