I've read the threads with the glowing reports on Gunzilla, so I broke down and bought a bottle. A bottle cost me $16 by the time I added shipping, and that would have bought a lot of Hoppes. I hate having to order it online and wonder: If this stuff is so good, why isn't it in gun stores?
On my G30 barrel, I did notice that it seemed to desolve the gunk and grime a bit faster than Hoppes, but like the instructions say--let it soak for a while. I still had to scrape loose a few chunks of waxy build-up, but I had to do that with Hoppes also. It is nicer in the smell department, or lack of!
Next I cleaned my .22 conversion kit for my G30. The barrel tends to lead up and takes some wire brushing to clear out. So I soaked a parch with Gunzilla and ran it thru. On about the 4 pass, I felt some crunching and out came pieces of lead. I ran a new soaked patch thru and nearly all the lead slid right out. Score one for Zilla. I let it sit while I cleaned up the slide, and mag, and when I came back, one swipe of the wire brush showed no lead left. Needless to say, I was impressed.
It also worked well on my very dirty 4566. Again, let it soak on the really dirty stuff and it seems to desolve it all.
I can't make any claims as to it's effectiveness as a lube, etc. because I never had problems with Hoppes, CLP, or marine grease before. I guess time will tell on that issue.
So in a nutshell, I found that Gunzilla does smell better (in fact, doesn't smell at all), and cleans as well or slightly faster than Hoppes if you let it soak awhile. It does appear to displace any lead faster than Hoppes (or anything other gun cleaner/solvent I've used). I like that it stays "wet" rather than evaporating, which probably adds to its lubricating effectiveness.
Is it worth the extra expense? I'm still sitting on the fence on that point. It sure would be nice to walk into the LGS and pick up a bottle.