Having a package for Debian (and later on Ubuntu) would be really awesome. It's already available for Arch Linux and I expect the list of packages to be growing over the next few weeks.
One of the major points for me was how cumbersome the installation process for kernel modules is. Now I can just do make install which works on most Linux distributions.
Eeh, I never do a make install from the projects I download TBH, as the resulting files aren't tracked by the package manager.
A kernel module is just a matter of compiling and running `insmod` (or placing it in the correct path). You have to recompile it each time you upgrade your kernel, though.
But seriously, the proper way to do it is a kernel module which you then mainline. I wouldn't be surprised if Valve was to pick it up, since they mainlined some xpad improvements (and the wired version of those controllers)