I never found it to help much until I got to the point where my triceps were limiting me and I was failing close to lockout. If that’s not your situation then it probably won’t do a whole lot, but especially close to a meet it can help to feel some heavy weight in your hands and actually going through the whole ROM may have some benefits over partials.
A lot of people seem to like it just because they can bench more with it, like you have a 270 bench and now you can bench 315.