The StarTech LSATARND18 SATA Round Cable with Locking Latch provides a secure 18-inch long connection between a SATA drive and a motherboard. It supports a throughput of up to 6 Gb/s, and helps improve airflow inside your computer/server case.
Each end has a latching SATA 3 connector to secure the cable against accidental disconnection.
With a round design, the cable provides less airflow resistance than standard designs, which helps improve airflow within a computer/server case for optimum system performance.

Pros: Round is better than flat Thin and flexible and good quality.
Cons: none
Overall Review: I got a 6", a 12" and the 18" and all fit perfectly and take up hardly any space. I love round!