I think you'll be happy with them, the twist locks are big and expensive. As you can see my CP is very small, that was partly possible because I used these outlets. My whole set up is influence by the event business (corporate events, rock concerts, weddings) that I use to do audio and lighting for, if you don't do this type of work then you might not think to use this type of product.
Never listen to electric guitar.
Some folks look for answers
Others look for fights
Some folks up in treetops
Just look to see the sights