It shouldn't be stiff (the soft springs is what gives you smooth ride) but it shouldn't bob up and down either. The struts' job is to prevent that and it's likely that they are old. Unless you are getting excessive bob they're probably not completely blown, but it's unlikely they are performing as they did when they are new - some new struts should really clean up the ride.
Another good test is to take it over a speed bump. I was always told if it bobs up and down more than three times it's definitely time for new struts...
Another good test is to take it over a speed bump. I was always told if it bobs up and down more than three times it's definitely time for new struts...