Yeah, they take all the pros of prefabs such as the ease of sale and installation and get rid of the cons such as terrible design and build quality.

Pretty much taking a properly designed and built enclosure for whatever the shop needs (1 10, 2 10s, 1 12, 2 12s, 1 15, etc) off the shelf and throwing it in the car. Dont even need an installer on hand who knows anything about enclosure design, woodworking, or how to carpet/wrap a box. Just take it off the shelf, mount the subs, connect the wire to the terminals on the box, and send the customer on their way. More profit in the shops pocket because of the word of mouth of customers who are happy with the product, and the customer has a quality product in their vehicle at a good price.

Its a win-win.