The external chassis for the Intense-PC is made out of aluminum to also serve as a heatsink for dissipating heat from this fan-less Linux PC. The PC did get very warm to the touch during operation, but at no point have I encountered any thermal-related performance issues. The Intense-PC also supports FACE modules, which are a proprietary "Function And Connectivity Extension" module offered by CompuLab. Sold separately, available FACE modules for the Intense-PC can provide four Gigabit Ethernet ports with four USB 2.0 ports, two mini PCI Express slots, or four USB 2.0 ports (the default for the Intense-PC as well as CompuLab's Fit-PC3.
From the bottom of the Intense-PC there is a removeable door for accessing the storage bay and an optional mini-PCIe module.
As mentioned already, the CompuLab Intense-PC ships with Linux Mint so to no surprise there aren't any Linux compatibility issues with this system. Besides the Linux Mint installation, which worked out fine, I tried out other Linux distributions during my testing thus process so far. Most of the tests were on Ubuntu 12.04 LTS and Ubuntu 12.10. Both Ubuntu Linux releases worked out fine on the Intense-PC with Core i7 ULE processor with the only exception being that under Ubuntu 12.04 when going to "shutdown" the system, it would end up "restarting" the system instead, but that's been taken care of in Ubuntu 12.10.