Has anyone tried Verizon VoLTE on their S5?

Yeah, as far as what Verizon charges, copied this from their Advanced Calling FAQ page:

Advanced Calling 1.0 service is available at no additional charge.

HD Voice is included in existing plans. HD Voice calls are billed as standard voice calls according to your plan. No data charges apply.

A video call is an HD Voice call combined with real-time video. The voice portion is billed as a standard voice call, according to your plan. The video portion is billed as data, according to your data plan. No data charges apply to video calls transmitted over Wi-Fi.

Note: An average 1-minute video call uses about 6 - 8 MB of data. The actual data consumption of your video call may vary. You can estimate your data usage using our online Data Usage Calculator.
 
I enabled it on both my wife and my S5... Went to find the option on the phone... Not there.

Can't figure out how to get it active.