Advantage is fine, they are owned by Hertz to be their low priced option. I have used them in the past with no problems at all. If you use their A-PASS service its even pretty fast once you get to the front of the line.

Downside to both companies of the services is that the lines are usually not business people who are a quick in/out but vacationers who go through long drawn out "i've never rented a car before, what do you mean you don't take cash, or allow for my dogs to smoke, or have maps of the entire pacific northwest"