I started with a T1400 and would still own it if I had not tried to change the hydro fluid.
It never drove right afterwards, so I sold it for peanuts and found a T1460 for $500.
Other than an oil leak from what I think is an engine seal[I have not been able to actually confirm this] but I just check the engine oil regularly and keep it topped up.
Hydro drive works fine [ I will not change the oil on this one]