Ask HN: Is there a simple webinar software out there that works?

I want to run a webinar to show people how to use our product. I literally just need these 3 things:

1) Ability to share my screen in near real-time (I don't need webcam features for this, I literally just need to share my screen to demo the product)

2) Audio so that when I talk, the watchers can both hear me and see my screen at the same time.

3) Chat box - a simple chat box that allows everyone in the room to talk.

I've tested literally every single solution on the market, including Gotowebinar, meetingburner, fuze, ustream, livestream, spreecast, google hangouts, etc.

Every single one has major issues or is overly complicated to use:

Some issues with current solutions:

1) Huge delay in broadcasting (i.e. google hangouts on air had almost a 60 second delay)

2) Viewers had to install software to watch the webinar

3) No screen share capability

4) Overly expensive (ustream is $300 minimum to have no ads and to do screen sharing).

5) Stream quality is very poor

6) Screen share feature, but people have to call into a number to hear audio.

Please someone tell me there is a simple solution out there for people who just want to share their screen with audio and have people watch and learn.