To me the Tropica substrate looks very similar to Dennerle's Deponit.

What puts me off with this type of substrate (as it did with Deponit) is that it needs to have a layer of gravel on top... I avoid layered substrates like the plague because 1) I've never found any benefit from them, especially over products like Flourite (haven't tried ADA AS yet) and 2) I hate pussy footing around when planting or rescaping trying desperately not to pull the bottom layers up on top of the gravel and into the water column...

Sorry, pet peeve of mine!

But I'm really interested to know what they've done to TMG as this is (was?) a great Fe + trace product that I use. I heard somewhere that along with changing the name they may also have changed the formula (someone mentioned that the new stuff has sediment, something I never saw with TMG)?