I can vouch for the Hefty aluminum bumper. I absolutely love mine, and my MPG has even gone up since installing it.Did exactly that once I read the news. My dispute is currently in progress and I've submitted email evidence supporting my case and Shrocks lack of contact. My only potential issue is my card is with Wells Fargo and typically their max dispute time limit is 120 days and I'm beyond that. However a higher level rep was willing to help me get this resolved and push it through so fingers crossed.
Considering White Knuckle sliders now and maybe a Hefty Aluminum bumper in the future.