This is a project that is never complete, as there are always updates, additional functionality, things you want to try and fiddly little things to try or change. It's a tinkerer's wet dream of a project, but not one for someone who wants a simple "plug in and go" device.
In my opinion, no.I started wondering whether or not you could just buy a double din unit that will contain everything, and it's just as easy to install as a new receiver. Well, I found the Guru in the mp3car.com store, but it's advertised as a test unit. Infill G4 also looks like a good unit, but seems out of stock. There are a few units that look good over at revo-sys.com
Are any of these worth buying? Are there better ones out there?