Electrolytic caps are likely the least reliable component, and the capacitance value will change as the electrolyte dries up. Granted, we tend to be talking about 20+ years for this to happen.
I also think that electrolytics tend to come with wider tolerances.
For many applications, they are fine, but for a crossover application, likely other types of caps make more sense
Great example, I just received my Phil BMR kit from Meniscus, and there are no electrolytic caps to be seen!
I found this with a quick google:
Among these drawbacks are large leakage currents, value tolerances, equivalent series resistance and a limited lifetime.
Read more
http://www.capacitorguide.com/electrolytic-capacitor/