My experience at VIE was perfect (back when I was OW Sapphire): I used priority check-in, got priority bag tags, got access to priority security. No priority boarding though. Online BP also mentioned ability to use priority security. And I got lounge access with no problem.
What I don't like is that I'm only able to use benefits after check-in or by calling customer services. Why can't they recognize my status when purchasing ticket and let me choose my seat online?