specifically the rate at witch things cool down, at first i was pretty happy like yeah i can really streamline my mold pouring's but now that im in the iron age... kill me just kill me, iron blooms/ingots cool off faster than it takes avocados to brown in open air its nuts! and i've got perfect hands and joints id hate to see how awful it is for anyone with arthritis or slower reflexes honestly this change has made knapster seem mandatory for all but the most spry