From previous reviews in this chain this is a longstanding problem with Advantage at Las Vegas McCcarren Airport.  Waited in line for 2 hours to get rental car.  Advantage check-in process is broken.  We started timing how long the counter personnel were taking with each customer and it was over 15 minutes per person.  Up selling is one thing but this process is completely broken.  There were 4 counter personnel but only 2 were working at a time, while the other two would rotate into the back room and hide out.  All other rental agencies in rental terminal appeared to be moving efficiently and I saw no other lines.  At one point Security guard approached the Advantage counter personnel to point out the lengthy line that was inhibiting the flow of people throughout the rental terminal and the Advantage counter person just laughed and told the security guard to do whatever she wanted with the line.  BEWARE and if in a hurry do not use Advantage.  For me NEVER AGAIN.