Cloaked/burrowed units have become pretty popular as of late. I'm curious as to folks opinions about means of detection. Missile turrets are a good early means of detection, but they're fragile and can only attack air units. Ravens take awhile to tech up to, and then to build, but are mobile and have other uses in the form of special abilities which allow them to attack both air and ground (I also haven't had the opportunity to use seeker missiles and I'm curious as to how good they are). Outside of detection in the early game, and desperately saturating your base if caught with your pants down in the late game, I'm wondering if Ravens make for a better detector choice in the long-run and curious as to folks opinions on them.