I used a machine much like the GCAB at my local gym back a few years ago.
It works exactly the areas it’s intended to.
I have neck issues so I’m unable to use ab machines that require overhead arm use. This machine is amazing! I can work my abs, back and side obliques without fear of neck pain.
Weight plates must be purchased separately so I purchased 4 10 lb weight plates and a couple 25 lb weight plates. Found them at Walmart much cheaper than any other place.
This machine is quite easy to assemble as well. I purchased mine then my best friend purchased one. We both love love love it!