I just installed two new Chamberlain openers with their proprietary My-Q interface. (One had the WiFi and the other linked to it, but I control them independent).
It actually works very well. I also added a My-Q controlled light switch to the outdoor lights and tied it to the opener, so they turn off 4-1/2 minutes after the door closes.
Gotta admit... it's kinda cool to watch the doors from my BI remotely and click the My-Q app. My daughter goes off to school three days a week and closes the door once, at best.
For a simpler retro-fit, you might try these:
http://garagedoorbuddy.com/
Just my $.02.
Jim