Nope. For me, it's like this. I have always noticed that when it comes to strength, the fastest way i make gains is to use bad form. So with the bench, I will go ahead and pop my hips off the bench, bounce the weight, etc, if that means I can handle more weight.
As i get used to handling this weight with bad form, it becomes very easy to just tighten up my form little by little, and then I am suddenly able to handle that new max with strict form. The slingshot basically mimics this for me. If I can work up to 455 using strict form with a pause while using the slingshot, than that means my body gets used to break, centering, balancing, lowering, controlling, resting, pressing, following through, locking out, etc 455 lbs.
So while the slingshot helps me get a little pop off the chest, and helps keep my elbows tucked, etc. I get so used to moving 455 strict with the slingshot, that when I take it off, putting 405 on the bar is suddenly much easier to do, even without the slingshot.
I do have a youtube channel, though, if anyone cares to debate my claims. You will see that by the end of february my max sloppy bench was 405. By the first week of march, I could do 425 sloppy. And now, in my most recent video, you see me do 375 at the end of a bunch of sets, with strict form and a long pause.
That was without a spotter, so I don't know how high I could have gone. And one week ago, I was in the gym, and did 405 strict form, with no pause.
Just a method that works for me.
I mean, I have only been training heavy since February 1st, when I maxed out at 350 on bench (with bad form).