Well after weeks of research in reading reviews and watching videos. I bought the Panasonic TM700. I too was worried about this fan "hum" / noise that some were complaining about. So.. I did some tests. When I use the TM700 in my normal every day video recordings.. which are family events, birthdays, holidays, Christmas day, kids hockey games, kids school plays.. there is absolutely no fan noise or fan "hum" present.. if it is there, it is inaudible. I did another test where I recorded some video in a room with no noise what so ever. I played the footage back and used the TV speakers as a testing ground for the sound... even when cranking up the volume to 100%, all I could hear was the hiss of the speakers (because I had it cranked). No fan noise, no hum. I then played the footage back and ran the sound through my Surround Sound system.. as the camera has 5.1 surround. In a normal volume level.. there is no fan noise. Only when I cranked up my surround sound volume to almost full, this is where in the REAR LEFT speaker I could hear a slight HUM which was mixed in with the HISS of the speakers from being cranked up. There is no way you would hear this hum while watching normal video recordings. I can also say that I recently had to attend a family funeral where I was asked to take some video for other family members who could not attend. In this environment, you can't get any quieter... I reviewed the footage, and even with the slight silent chatter amongst the guests.. you heard nothing... no fan noise, no hum. So In my case and with my unit and my application. I have not run into this issue. From what I can see the TM900 has the fan... so it could not have been that big a deal for Panasonic. Get the TM700 if you can... The TM900 will be much more expensive.