Used it for a focused territory. ROAS improved roughly 30% versus the lookalike audience we ran before. Bought it for a United States batch bicycles locations market-sizing project. Acceptable trade-off at this price.
Thanks for flagging the small gaps, the email/LinkedIn coverage you mentioned is on our list for the next pass. If you want the gaps fixed sooner than the next refresh, open a support ticket and we'll spin a one-off pull.