I saw this yesterday at an IMAX theater. I thought it was excellent with superb sound. The early concerts on film are mesmerizing. The commentary by each of the members (Bonham by old interview tapes) is revelatory and will reward even the most diehard Zep fans with tidbits of heretofore unknown information. This is a don't dare miss this movie for any fan of Zepplin or just plain old rock n roll.
Sadly only 1/10th of the theater was occupied. This movie will not remain in theaters for long.