I've been going back and forth between two sheets of H3 Neo, both 39 degrees commercial ones.
The first sheet I bought as 2.1mm in June, the second one I bought as 2.15mm in November.
I've boosted and reboosted both sheets a few times.
The older 2.1mm sheet seems to react better to booster. The sponge has softened up more and it plays more dynamically. It feels much closer to the 37 degrees version sponge wise but hasn't lost the bite of the harder topsheet.
The newer, 2.15mm sheet just doesn't seem to want to soften up. It doesn't want to turn into that dynamic, boosted rubber feeling.
Am I imagining things? Or is this something that just happens with the commercial sheets? Or, is this because the booster (Regular Haifu, which I also bought in June) has lost so much effectiveness in 5-6 months that it can't break the sponge of the second sheet anymore?
I mean, the experience with this second sheet has been making me doubt staying on the H3 train altogether... But the first sheet still feels really good even at its current age.