Not to bring the old thread, just wanted to share my experience with Lubegard Red.
My parents bought '95 Accord in 2003 with 52k miles. Transmission was shifting very, very harshly. Probably a previous owner didn't change a fluid or most likely changed it with the regular Dexron. At 54-55k miles I got tired of it and did 3 drain-fills with Z-1.
There were a lot of shavings on the magnet. I would say it was completely covered by it to a thickness of 1/8''.
Shifts became significantly smoother and better. After about 200 miles I've added a bottle of Lubegard Red to transmission (i.e. 3oz over the recommended value).
I know that Honda transmissions are picky to a fact that atf has to be changed at least every 2 years. Somehow, my father forgot to do a service and drove 40k miles on that fluid (3-3.5 years). And I must say that he used that car for a delivery service - constant city traffic, stop-and-go, a lot of shifts 1-4.
Then I leaned that he has 40k miles on the tranny fluid I changed it again with the single drain-fill. This time magnet drain plug had very little stuff on it. I was quite frankly very surprised by that fact. I would think that ATF was in service for only 15-20k miles, no more than that. Definitely not 40k.
After a single drain-fill with Z1. Shifts became smoother, but just a little bit. Which also surprised me. I was expecting more pronounced improvement in shifting.
One downside of adding lubegard is that ATF darkens significantly after few k miles. If regular ATF is light pink, ATF+Lubegard give dark-red, almost cherry like color.