I can't reply from experience, becuase I don't actually have the unit, but I've heard wonderful things about it. I was planning on buying this for my 4Runner which I finally picked up 2 weeks ago, but I am going to hold off.
Eclipse just showed off the improved model (AVN5495) at the 2005 CES Show, and it is much improved with a 30gig jukebox hard drive as well as higher 5V preouts. It will probably be bumped in price, but I am going to hold out. My local Eclipse dealer is saying possibly May for a release date. From what I have heard they have also prewired the unit for it somehow to be functional with the steering wheel audio controls we currently have in our trucks which is pretty sweet as well.
-Clay