Had mine on since last summer and am happy with it. I did feel like there was a bit more oomph, but it's nice to have it backed up by actual testing.
Do have a question though...there were no fitting instructions available when I took delivery of mine and I ended up struggling a little as I fitted the snorkel first, which he didn't do in the video. I managed it eventually, but I'm worried about dissembling it when I need to clean the filter....is the intention that the snorkel should come out to make disassembly as easy as possible? As that means taking the bumper off again. I can do that, but I'd prefer not to have to every year.