I bought one of the original “Wrist Rocket” jobs many years ago.... Quite impressive.
This design is still superior, IMO...Takes all the strain off your wrist and allows a heavier set of rubbers to be used.
There is a “slingshot forum” I used to visit regularly, but as I recall they seemed to favor the more traditional type.
https://slingshotforum.com/
The disadvantage of the wrist rocket was that it was unweildy to carry around, being all solid. I currently have a Daisy-marketed number that folds up.... Easier to carry around.