i used them 4 times, each time spending $5 for 7 days
the first time, i got a sale - i was thrilled
the second time, another sale - again i was thrilled
the third and fourth time - nothing. not even many views
impressions are useless. views are nice, sales are even better. one sale for $5 made me happy, and to me it was worth it, but overall i would say pass on the etsy search ads.