I replaced my Green filter with the new aFe filter a few weeks ago, and I like it. I don't really care about being able to hear intake noise, so having a quieter filter is neutral for me. I have not noticed any downsides (other than less intake noise), and it seems to flow better -- but that's hard to judge because I added an E30 tune shortly thereafter. I'm not sure it's worth replacing what you already have (Green, K&N, whatever), but if you're stock, the aFe filter is a nice option.