i had bought my last two cars through a car buying service with great results. unfortunately that company was unable to assist me in my recent search for an Infiniti FX-50. i did some research and determined that Authority Auto had some good feedback from sources that I trust, (e.g., Edmunds.com, etc). the search for the car took a while, due to there being a limited number of cars available with the options i wanted. my rep at authority auto worked tirelessly to find the right car. even going as far as contacting the manfucturer to understand future shipments. once we found the car, the transaction was done in less than a day. i picked the car up the next day. my authority rep negoitated a price under dealer invoice and got me a very competitive financing rate. the whole experience was great. i literally spent just over 1 hour at the dealer. my rep was in constant contact with me throughout the process even while i was at the dealer and several days after the transaction. i highly recommend authority for anyone buying a used car. they are competent, professional, and get results. I would definitely engage them again in the future. 

hope it helps. 

Bill A. 
Vienna, VA