The 1600 Series replaces the larger frame compacts. THe 1533 and 1540 remain in the current product but only in the 8x8 SynchroShuttle. The 1635 replaces the 1533 in Powershuttle and Hydro and the rest of the 1600 Series grows in size from the 1635. THere are more models now than the 1500 series large frame compacts. THey mad some really nice changes but there are a few carry over 1500 Series that over a better price advantage. I would check out the MAssey Website:
Massey Ferguson or visit your local dealer to learn more.