Bomb-proof. Last forever. I have 3 pairs of Marzocchis ('98 Z2 BAM, 2001 Z3 QR 20, and 2003 Z1 FR QR20pro). I don't use the Z3s, but they are good forks. The Z2s are still in operation. I service them once a year (change seals/oil) and they work as well now on my hardtail as they ever have. Marzocchi makes great forks and stands behind them for sure. Ride well.
K.