Talked with a friend Monday, who has had one done. Per him, he said it was difficult, but partly because when asked how active and fit he was he told them pretty fit. He is pretty active and fit, but not a professional athlete.
Question was asked due to removing part of his hamstring tissue to replace the ACL instead of using a cadaver's.
He reports those older than him who used a cadaver's were well ahead of him in the recovery process, and his recovery was long and difficult.
That's all I have, but understand now why I talked with him and it's been 8 years since we talked. Per his results, use a cadaver's tissue.
God Bless,
David B.