I should have been more specific in my post. I would not drive a couple hours solely to pay a visit to Paradise Pen. I would make a day out of the trip. There is more to do around Chicago than just Paradise Pen. But yes Paradise Pen would be on the itinerary for the days visit.
You might not even need to make a trek into the city. Oakbrook Center is a nice, open-air mall to spend more than a few hours at and then after there are many good restaurants, including Dikta's (especially if you are a Bears fan)