At my new place of work, We use Cisco / Webex quite a bit for webinars. We use it for video, slides, audio and webinars and the product works very well for the most part. We use Event Center and its a robust offering that allows for recordings, multi site presentations, video, audio and powerpoint. All of these features are much better than any other platform available currently.
The Event Center platform does not support mobile users, so no smartpad /Smartphone users yet. A lesser Webex offering does support mobile and that is called Meeting Center. It does not have the advanced functionality however. Really? less is more? Huh? really?
Cisco / Webex assures me they are working on incorporating mobile to the more advanced offering they are just not there yet.