Yes it's a real brick of fins. The packaging is very well thought out and keeps it from getting damaged unlike the ThermalRite coolers which I've always had arrive with damaged fins. It's not as heavy as I thought it would be for as big as it is.
For 1366 the Mugen 2 kit provides a speciual driver to take the socket clamp off the board so you can take off the stock Intel backing plate and replaceit with the Mugen backingplate. THis mates up to the socket clamp perfectly and then you put the mounting clips onto the Mugen with the provided screws and then you attach it using the 4 provided screws from the backside of the mobo...which is different.
ANyone that has one of these should consider cutting a hole in their mobo tray right behind the cooler so you can take it off without having to pull the board.
I found that once the cooler is in place it is almost impossible to access the two screws for the little external heatpipe cooler on the X58 UT.
Also because it issowide I could not fit a fan on the front with the G Skill Balck PI...the coolers on the RAM in the two slots adjacent the CPU would hit the fan.
Lucky for me it's an Antec 900 so I aimed the air to flow upward and out the top
There is enough room for me to set another fan on top. I have a 1900 RPM S Flex that I may use when I am OCing.
But just like all the other HSF MFRs Mugen neglected to include any extra fan mounting clips.
Again luckily I can just lay a fan on the top
But what the hell is the deal with that? THey are nothing more than some bent wire...would cost pennies to include two extras.