Here's my guarantee: I'm not offering a guarantee
...at least not in the "traditional" sense. I don't believe in them. A guarantee gives you a way to back out from achieving what you want. It allows you to give up on something that you want to achieve.
Not having guarantee means you have to "burn the ships" so to speak. You MUST take action because there is no other option.
That being said, here's what I AM offering. If you actually TRY the subject lines and aren't happy with the results, just show me what you've done and I'll GLADLY refund you every penny.
I haven't had a single refund yet.
I'm doing this because I truly believe it's the best way to ensure you succeed. I know how it easy to just refund something because you're too scared to actually take action. And I offer that guarantee because I KNOW these subject lines work.