I don't like the alu / steel mix cassettes but with only the largest cog as aluminium... it could be OK. On the 12 speed cassettes the lowest gear is generally so low it doesn't get that much use, and you'll always be shifting from or to a steel cog so when it does wear, it shouldn't completely kill the shifting.
However what annoys me is that the headline price is just for 11-30, the 11-36 I want for my Marmotte set up is a full £20 more which pushes it beyond the price of all steel monoblocks (and TBH I value the all steel reliability / longevity over the tiny drop in grams). I will likely bite if it drops a bit in price.