If I sell a pup which is VERY rare I love to hear from future owners. It helps me get to know the person & lets me know that the pup is going to a caring home, which is very important
I also like to keep in touch throughout the pups life as I feel if you breed you should be responsible for re-homing in future if it ever becomes necessary - I would always have a Chi back to keep with me if it ever needed a new home for any reason.