Had a L2500DT I bought new in 1999, put 820 hours on it. At around 400 hours, grenaded the rear end trying to push a tree over. Just last week, bought a new (2006) L4400DT, have 4 hours on it, had one on it when I got it.
My L4330 HST has 427 hours. I put about 100 hours per year on it taking care of my wife's horse farm - mowing and harrowing pastures, harrowing the riding ring, pushing the manure pile with the FEL, and snow removal.