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I would take the past 2 year of QC issues with a grain of salt. Western brands couldn't visit factories and check qc/assembly process until this last summer for Southeast asia, this autumn for Taiwan and just now of after CNY for mainland china. So we will see if the Marin is well made but the design is nice and...

Two set of flip chip at the chainstay dropout and at the seatstay rocker connection should give plenty option for mx/29 and HA adjustment. Headtube look to be slightly tapered maybe ZS49/ZS56 ? And Marin have the habit of making frameset available for most of their model. Looks to be a really nice budget DH bike.