When selecting golf nets, the most important selection criteria is security. You and your fellow golfers should be and and feel secure (free) from harm of a golf ball in flight when using a qality golf net. Basically, golf nets are security facilities designed to protect people and property from a swift projectile (ball)...to always capture this force...arrest, retard and drop it harmlessly to the floor or ground.
Golf net security and safety is the responsibility of both the golf net manufacturer (materials and construction) and the buyer/user (installation, operation and maintenance) of the golf net. The latter, more importantly here, should equate the security of the proposed facility to be purchased with the anticipated risks. Some things to note are: in the backdrop net area (where balls hit directly) the golf nets should be a safe distance from the frame members to avoid ball rebound...that the backdrop net is of the durability capable to withstand the intensity, wear and tear...that it is hung baffle loose to capture and decelerate the hardest hit balls with comfortable silence. The top and side golf nets should be securely attached to the backdrop net and side - floor bottoms be of ball capture integrity. The facility should be large enough to cover the highest risks.