For me its important that my sponsor has a sponsor. This ensures he's not flying by the seat of his pants and giving me his own version of AA.
And when choosing a sponsor its wise to choose one that's living a life you aspire too. That way the wisdom he's learned from making mistakes will get you there quicker.
As for sponsoring guys, some stay with you for a lifetime, which is very rewarding, especially if they have kids you can watch grow into accomplished adults. Other's didn't get what they were looking for when they went through the steps so they try again with another sponsor, which is fine by me.
Sponsorship is another ' phase of our development' that we all go through some time or another. Some sponsors give it up and go into other types of service, which is all part of their growth in AA.
In AA we're all entitled to grow in any direction we want as long as its up the way!