We use chromecast at work. Never tried streaming from a phone, but we connect from our PC for presentations.
I have my PC directly connected to a TV for Netflix...the better half just bought a smart TV and can login to her Netflix account directly thru comcast. I think that's going to be more reliable than chromecast if you're in the market for an upgrade anyway. Our chromecast does have odd lag issues at times...but it's pretty insignificant for just running webinars and presentations.
For 40 bucks it gets the job done...but for 8 bucks you can get a hdmi adapter from china for your smartphone and plug it right into the TV to stream Netflix or whatever you want.