I have a Ventrilo server I'm holding onto from WoW for whenever our group of friends gets raid-ready again. Most of us play on PC, so it works out pretty well (not to mention the spate of free Vent apps for iOS and Android that could accommodate PS4 users). Will be interesting when we have to PUG, though...

I'm personally a huge fan of voice chat for group content. In my opinion, it's a lot more fun when you can actually talk with the people in your group. It helps you get to know them better, and helps you ruin their lives with endless waves of puns and dad-quality jokes.