Enhanced Sitelinks frequency
Have you seen a lot of enhanced sitelinks (sitelinks with text beneath) so far?
I´ve seen none, and of course that could mean that very few advertisers have implemented them yet, but it could also mean that Googles rules for when to show them are really tight and thus they are allowed to show very seldom.
How tight and how seldom and what are the rules - are for me imporant questions as I possibly have a few hundreds (at least) sitelinks to add text to. But should I...? Would it be an effective use of time/resources? SHould I choose to enhance just a few? Which ones then?