Obviously the suction cups run the risk of coming undone during performance, but nevertheless it's a great tool I'm happy to have.
Bonus points for the small size, and simple construction. Its quite flexible in the position you can put it on the guitar, which is a plus.
The Barnett guitar support (the BEST support ever) is more stable and adjustable, but also more expensive and can only be installed/uninstalled with patience between string changes.
On the other hand, the Gitano takes 5 seconds to put on and take off the instrument. This is useful to me because I often switch between my guitar, a student model at work, and the occasional nylon-electric at Brazilian rodas.
Good price too!