The set-up is really easy. See that one bar sticking out? You pull this out from the main body of the dock and then the little silicon insert just pops out. Wrap this round your cable (I use a lightening cable), pop it back in, and put the bar back in in the main dock. You wrap the cable around the bars to keep it out of the way (I would prefer them channelled through the dock and hidden but it still works) and you’re good to go.
Criticisms? The bar can slide out occasionally and sometimes the silicon gripping the cable can slip but not often (only happened once in a month of everyday use). If it happened a lot I might glue it in place.
Pros? I couldn’t find a better or cheaper case that works with my iPhone 5s with a case AND holds the cable in place (rather than just a phone stand where you can plop the phone in with a cable attached). And it’s cheap. Did I mention that? ;-)