How about this for newbie ??
http://arduino.cc/en/Main/ArduinoMateria101
Check after sales support and documentation. That’s fundamental. Be sure they will fix anything that might break and replace parts. Check guarantee and check documentation of use.
These machines can fail as it is a new technology. If you do not want to spend your money on a “possibly” broken machine you need to be sure the manufacturer will fix it free for charge (including shipping costs).