The ease of use, how intuitive it was to learn as well that this thing can be used by anyone with no previous experience in CAD/CAM or drafting! It has many options but I don't think there's anything too frustrating about using them all since they are very easy (and fun) buttons / icons etc., so we had little trouble figuring out what each one did once we'd gotten past its initial learning curve - if any at al!. We have been able to design our landscape plans quickly without having professional help from an engineer who would typically charge thousands per hour just because he doesn'r understand my needs; instead i am designing everything myself now!!