MyOwnConference

Being able to upload videos or playing them via youtube was awesome!

It would be good if the user interface was more friendly

The main schedule view is very useful when you've got a lot of webinars. Also, I liked the "always-on" webinar room.
The webinar landing page is very easy to set up, you can choose which fields you'd like to add and select a suitable background. A unique feature is the social media registration - I found it really helps with maximizing the registration rate.
The webcam quality is very decent, even with the free plan (720p) - hardly any pixelation and runs smooth for the attendees.
A unique feature is that I can pause the webinar for x minutes. The attendees would see a countdown until the end of the pause. I found that useful.
I also liked that the follow-up email automatically features the webinar replay.

The layout of the live room - the chat, webcam and the slides kind of feel like they're stiched together. The live room design could be improved a bit.
Second, I would love it if they added some analytics for the registration page. I'd like to know what's the registration conversion rate.
Third, the confirmation email & the post-registration page should feature an "add to calendar" button, so that my registrants could add the webinar event straight to their calendar.