The ExtrusionBot may look nice and have a spool built in, but the spool isn't functional-

http://www.youtube.com/watch?v=FSRYBb6PPYU

There is no mechanism for supplying tension to make the filament hold flat to the spool, and there is nothing to make the filament spread across the spool rather than bunch in the middle. Also any excessive jerking from the spool is likely to stretch the filament at the nozzle ruining the tolerance.

You can get a FilaWinder with the Filastruder kit along with the laser cut enclosure and still come out $100 less than the ExtrusionBot. The ExtrusionBot extrudes faster, but I think you would find that the Filastruder will still make filament faster than you use it up.