Go with the free one if offered with your head unit. I had to break out the rotary cutting tool to shave off all the unnecesary tabs around the edge. So it wasnt all that compatible with my vehicle afterall. The cd slot is only big enough for a single cd case - just saying. After modding, it worked - and thats what counts right :)

The added slot works great for a place to keep the empty case for the CD you're playing. It was an easy install in my 2001 Ram. Very pleased with this unit.

If you're installing your own car audio system use Scoche harnesses and adapters. You'll be glad you did! There's a product for every make and model and they make the job much easier.

Unfortunately, if you upgrade you car's factory stereo system, you will need to purchase a kit with the necessary trim pieces to make the installation look decent when you've finished. Sonic had the kit I needed, the price was fair and they delivered quickly.