Plus, you are going to need someone with you to help you out with the shirt...
They are expensive and if you don't know how to fit your self...you going to buy three or four before nailed the correct size for you. All of those brand run different.
Slingshot, ram and/or catapult are a great tool. But do not focus 100% of your training into this.
Add some , dead press, floor press etc to add some poundage to your bench too.