We have one full towel rack in our bathroom - it's tight, but we have a closet where there is a heat register in front of a window.  So, knowing that double wall mount towel racks don't dry towels well, I thought we'd try this.  Assembly was easy.  Have a rubber mallet to make a tight fit.  
We placed it over the floor heat register in the closet and now any one who uses it this fall/winter will have a dry, and possibly warmed towel for their shower!

Pros: Sturdy, easy to assemble, arrives in a small box
Cons: You really should have a rubber mallet on hand to get a tight fit w/o scratching it