These guys were very informative, knowledgeable, efficient and I am only giving them 4 stars (out five) because of the fact that I showed up unexpectedly at the end of their work day and couldn't get an appointment right then and there. However, they accommodated me with their very first appointment the following day. :) I found the atmosphere very comfortable and everyone I spoke with was friendly and willing to answer my questions. Very helpful service! I LOVE my perfectly installed car audio system. Thank you Plane Music of Enid, OK!