Beersnob,
Many hair stylists order #22R stock systems and dye them to match a customer's own hair. The #22r accepts color really well. How long a coloring lasts depends on the type of coloring that is used. Semi-permanent dye will wash off after a few washes and need to be re-applied. Many times it's not necessary to re-color the whole piece. Just touching up where your own hair meets the hair system is often enough.
Regards,
John