Yes, it is cheap.
Yes, it is easy.
Yes, it will lift the body off of the tires.
But no, a body lift is not a legitemate lift for offroading.
You are probably scraping on the frame when cresting a hill, and a body lift won't fix that. A body lift will only raise the center of gravity and won't give you any additional offroad capability.
There are legitemate reasons for using a body lift.
1. While doing an engine swap, if the motor/tranny doesn't fit under the hood the body lift keeps you from having to cut the hood.
2. ...can't think of any others.
Ok, so I'm not a fan of body lifts. They look stupid (air gap) and they don't add capability.
Go with a real suspension lift and you will be happier on the trail.