My company used to use National. It was so nice. You could just walk into the garage, get into a car, and leave. I used the National Emerald Aisle for years, domestic and overseas, and also was able to use it for personal travel (on my own dime of course).

Then we switched to Avis and now I have to wait at the counter for someone to help me. Last time I traveled I had to wait like 20 minutes because the line was long. I hate it so much.