Tried Relevanssi a few versions ago but it didn't work correctly, so used Search Everything on a various client's sites.
However, latest version of SE (or is it a WP update issue?) returns haphazard/unreliable results with highlighting (which is an essential component).
Clients will no longer tolerate remote locked/API plugins like Yolink or Swiftype so back to try Relevanssi new version.
Works a treat - the author has engineered an astonishing array of options - but importantly, it's faster than SE.
Nice goin' Mikko - will put the Pro version in the budget.