I don't know about instantly but I imagine people will be into it. I mean ethereal has 2 bonuses to its name. Void damage and no interference or burden.
My mace I don't have that stat helper thingy so I can't figure out the base damage but comparing the scaled down version to my level, mine has almost twice the power. Now void is good for critters that have a resistance to crushing in this case. At most it would cut down the damage in half making these the same in that respect.
But for the opposite side, mine gets more damage out of the critters that are weak to crushing. At most twice the damage. But the strength stat on the ethereal is better than mine. Mine has my 4 turn proc all ready for me and your is 3.
All in all, good and bad stats across the board. But people will buy it if they feel it is better than their current one.