These seem very nice, run around 1100, there are some videos of how they work in this link as well. Great customer service, answered all my questions, offered phone numbers to talk live. I wound up not pulling the trigger on anything, but if I did, it was going to be for one of these units.
http://www.adcmobile.com/category/na...ta-highlander/
There are 3 options, Rosen's haven't been very reliable and these guys stopped selling them due to reliability issues, and these Advent units are much more reliable, easier to use and have a few other nicer features. I don't trust the China units personally, they seem cheesey. The other regular double din units look silly in Highlanders, at least they do to me, I like the look of the full factory style units much better.
Not many people on here have put these units in from what I can tell on here. At least, if they have, they don't post up much about them. Good luck, let us know what you choose and how it works afterwards.