Does anybody have any experience with the CG lock seatbelt attachment? It says it provides some of the support of a harness without the hassle. Heres the website http://www.cg-lock.com/. Wondering whether it'd be worth getting to help hold me in my seat better.

 

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All it does is u pull the seatbelt tight and use that device to hold the seatbelt so it doesnt gather any slack. Sit in ur seat and buckle up, after ur buckled up pull the shoulder strap up away from the end that buckles in and that's basically how it feels.