Really Good but Not Awesome Yet
I've begun using LiveWebinar and have to say that it's really impressive. I did one training session and one coaching call. The sessions went smoothly and all of the tech performed as advertised.
My one taco takeaway comes for two reasons.
First, it's expensive! $495 for 500 attendees and 30fps recording. That stings a little. Gone are the days of getting the moon for $49!
Second, I really wanted to use the embeddable registration forms but they offer very few customizations and they don't look so great embedded in a web page. Dark gray padding all around. Would have been nice if the default was white.
Aside from those two things, LiveWebinar is a solid (and initially expensive) options for webinars. I really look forward to using it more in the very near future.