It is a nice feature to have. One of the perks of having a 4Runner.
Here are a few things about it that are not so cool.
1.) If you have a remote, you can open but you cannot close the window with the remote.
2.) The window rolls down on it's own, this happened to my 4th gen. only, not sure why that happened, probably hit the button on the key while at work.
3.) You try the rear window wiper and it does not work. The rear window is closed, but there is about 1/8 of a inch to go and the wiper thinks the window is open. So, if your wiper does not work, hit the up button for a second.
4.) Last week, I took a lawn mower to my parents, there was a little gas smell, so I cracked the rear window. When I got home, I forgot about it and it rained and I got the rear end of the trunk wet.
Other than that, it is a great idea. Especially when you go to Home Depot.