I tried out some of the Metal Madness and am fairly pleased with it. I should give some background, though. I love polishing metal around the house. We have a lot of brass and some brass-plated stuff that I keep shining. I also tend to polish metal fixtures like faucets and such. So I have tried my fair share of polishes. Some of the ones I find useful or enjoyable are as follows (keep in mind some of these are not appropriate for aluminum):
Brasso: I find this product useful because it is so strong. But I really hate it. It smell horribly, it never seems to buff off completely, and the rags I use are basically ruined by it. The Brasso never really washes out and it makes everything else it gets washed with smell like Brasso. So I recently pitched my bottle of it. I just couldn't take it anymore, even though it works well on really oxidized stuff.
Wrights: I like this a lot because it is almost as strong as Brasso, but it's water based. So I can easily wash it off of metal, or just buff it easily off. And, while it does smell chemically, it isn't terrible. This is my choice for stuff that is in bad shape.
Meguiar's All Metal Polish #28: I ordered this stuff out of curiosity, and it blew me away. It is an easy paste to use and buffs off super easy. But the shine is absolutely incredible. Our faucets are unbelievable. I tried it first on the exhaust tip of my wife's car. I used to use AIO on it to keep it shiny, but the All Metal Polish made it look like a mirror. It was really incredible. Unfortunately this product is pretty mild and doesn't cut it on heavily oxidized metal (but it is safe for coated aluminum). That said, I am totally in love with this stuff. If something is bad I use the Wrights and then follow up with the #28. It leaves a noticeably better shine than Wrights by itself. And, it smells like a car wax. No chemical smell at all. Zero. I was pretty impressed. Also, it leaves some sort of protection because shower fixtures now bead water like a carnauba. And, all it takes to reshine them is just buffing them off. Water spots come off with a damp towel and the amazing shine is restored. The tailpipe on my wife's car has endured about 3 weeks of salty crud, but the shine is still amazing after washing and drying it with the rest of the car.
So, this is the background I had when getting the Metal Madness. It has some big shoes to fill to outperform the #28. Not only will it need to shine like crazy, it will need to smell nice and be a cinch to use. I have tried it on a brass lantern with medium oxidation so far. It worked very well and felt as strong as the Wrights. Also, it has a very mild chemical smell. The only bad part was it was difficult to buff off. It reminded me of Brasso a bit in that respect. The shine was really good, but I think #28 is a tad better. I'll have to try it on some other types of metal, though, to see if maybe it was just this lantern that was a toughie (although I'd polished it about a month ago with Wrights, and that buffed off easily. And it was much more neglected when the Wrights tackled it as it had been over a year since its last polishing). So, so far I find the Metal Madness to be a nice addition to the polishing arsenal, but not necessarily a must have. It's sort of like an all-in-one combination of the Wrights/#28 combo, but like any all-in-one, the results don't quite match the multiple step method. So if you aren't a polishing freak, it would be a great buy. If you are totally insane about metal polishing, the #28 is still the most amazing thing I've ever used.
P.S. I've never used NevR-Dull. When I was at Parris Island, it was Brasso wadding that we got. Out in San Diego they use NevR-Dull wadding. It was one of the weird differences between Parris Island Marines and Hollywood Marines. So I just always bought Brasso.
I think that counts for something. 
