I've seen a couple of his sparring tapes which I thought were pretty good as they were aimed at both continous and point sparring, saying what you could get away with in wtf style and in itf style. They were fairly old though and I haven't got a clue about the children ones, sorry!
Hee Il Cho's tapes are good, i don't know about the teaching kids tape but i agree with the sparring tapes being excellant and i must say his associations sparring teams are of a excellant standard.
his forms tapes are brilliant and his stretching/kicking books are among the best,
i recommend "masters stretch" and "masters jumping kicks", they are good books even if you are an experianced practitioner as they break all drills/exercises down with good teaching points.