I have several Bose products and my opinion is different about each one. In both of my Maximas I have bose speakers and they sound much, much, better than the "normal" car audio. Now, on the other hand, I purchased a Bose 321 system for 800 (refurbished), and was not very impressed at all. I have a pair of 25 year old KLH 12" and Cerwin-Vega 15" Loud Speakers and they sound much better than the Bose. The Bose 321 Cubes lack Midrange and High sounds. All they really put out are high-mids. I have my KLH's and Vegas set up side by side with the Bose and 25 year old KLH's and Vegas blow the Bose away. All I use the 321's for is the surround effect. Another Bose product I own is the original wave radio. It sounds pretty good considering it's size, but is a little pricey.
Just my 2 cents.