This looks like it just actuates a pushrod against the existing, regular charging handle?
Well, Ive used the Devildog Concepts Hardcharger which is similar, but slightly more elaborate since it includes a unitary CH.
View attachment 1087799
On the plus side, it eliminates the need to forward-mount your scope to avoid interference with your fingers when pulling the CH. It also looks cool and is non-reciprocating, so theres that. The CH can still be pulled like normal if required.
On the downside, It clutters up the top rail, adds weight, sticks out far enough to snag on stuff, and by offsetting the force applied to the charging handle away from the guns centerline, actually ADDS effort to pulling the handle back.
So for a benchrest rifle with a big, long scope, it may make some sense, but I wouldn't put one on a serious fighting gun.