I picked up my 2015 Model S last Thursday, and was too cheap to pay $3k for the package with the power liftgate in it. I was hoping that the Tesla liftgate would operate like my 2011 Volt. Unfortunately, it takes much more effort to close the Tesla than the Volt. Attached is my comparison video. Hope this helps someone currently in the buying stage considering what the power liftgate vs manual liftgate will mean to them. I still wouldn't buy it, but I do hope Tesla makes the manual option a little easier to use.
[video]https://youtu.be/_LvsSspDz4U[/video]
[video]https://youtu.be/_LvsSspDz4U[/video]