It’s 10% extra range, so not insignificant,
The 9-44 E13 cassette gives a 489% range, where a SRAM 10-42 gives 420% range… Don’t know where you learnt maths but I make that an extra 69% range myself!
but I’d say the disadvantages of half your cassette being made of aluminium far outweigh that advantage.
It remains to be seen, but the individual parts of the cassette are available seperately, so if you wear out the ally cogs quickly, you can replace just the ally cogs for a lot less than the price of a new cassette.
Plus it manages to be expensive in a world where XX1 cassettes exist.
I’ll grant you it’s not cheap, but it’s priced inline with the XG1180 X1 cassette rather than the more expensive XG1195 X01 or XG1199 XX1 cassettes.
Anyway, benefits of being in the trade and all that, about to buy one myself so will be able to give some feedback on it in the near future. Been getting very good wear out of both XG1195 and XG1180 cassettes that I have been using over the past year or so so far, so will be interesting to see how it compares.