Does the face scrach easy on the Vector?

Just got a new Vector and really like the watch. How durable is the face? Is it plastic, glass or mineral crystal? Do any of you guys use the guards they sell?

Thanks,
Hawk

	Suunto Vector - Click for more info Suunto's original Wristop Computer, the Vector changed the face of sport watches forever with its groundbreaking combination of features, including an altimeter, barometer, electronic compass, digital log book, and watch. Introduced in 1998, the Vector was the first watch to make it to the summit of Mt. Everest. In addition, the Vector won the prestigious European Outdoor Award - Product of the Year in 1999/2000.