Park and Ride for years most of the parking lot left of gas station for overnight parking. They CHANGED THAT. No overnight parking left of the gas station.
We take the bus to Chicago to save money and not deal with headaches. Unless you are planning on having someone drop off or pay the $$$$ for a cab to the park and ride STAY AWAY.
There is bus stops right down town so if you live anywhere near there or the near west side, there is no parking but cab ride is pretty cheap to get you to bus downtown.
Or if you are close to bus 2 line, that can also take you easily downtown to catch either buses.