I have the Slingshot. I chose it because Mark Bell gives a lot to powerlifting for free and I didn't like him getting ripped off by the other companies. Luckily it also works really well: easy to master, easy to put on, good fun and good overload capability. I get around 10-15% out of mine over my raw pressing. The Slingshot is also helping Hazzard come back from a shoulder injury and continue pressing.