Of course modding in general is a zero sum game. You so it do if for the enjoyment not the plan to recoup the cost. Those "results" come from bypassing the stock pcv system and collecting it instead of burning it off like it should. Your also going to get much greater amount during the winter, especially in areas that snow. Be sure to empty it constantly as a clogged/ frozen line can prevent the car from starting/functioning.I have a catch can and if you scroll up you can see some of the results. Now whether or not those results are "significant" or "worth it" is debatable. For me, if I spread out the cost of the catch can over the expected time of ownership (10 years), it's not "that" expensive and FWIW, I'm planning on using cleaner periodically as well.