I operated a John Deere 750 dozer with a hydro pushing coal in a power plant and it was great , experimented with it and coming down a steep grade off of the coal pile tried to force it from forward to reverse vice versa and it could not be done with the hydro it just slowed down could not push the lever hard enough to make anything bad happen this was back in the 1980's and right then I new a hydro was the way to go and I never looked back I bought a John Deere new 4400 with a hydro and I skid big logs with it lots of forward and backing 3500 hours of use and the hydro has never failed me ,infinite control of speed , no clutching , no gear grinding , no jumping out of gear , no reaching for the gear shift , set the throttle and you pick the low/med/high speed range and control the forward speed with one foot peddle in reverse just push the other peddle.Nothing much in the hydro itself to go wrong pretty basic compared to a bunch of gears in a standard. No whining noise on my hydro no noticable power loss less than one or two h.p according to John Deere specs. My hydro has held up to long pulls the same as any gear tractor that i have ever owned.. My 1st tractor that I lerned to drive on was a Farmall 140 , I have a JD X758 with about 1500 hours and it is used hard on steep banks , one time my JD 4400 quit running out in the field an electrical issue and I hooked the JD X758 up to it and was able to pull it part of the way to the barn , it ws doing some heavy lifting. I have heard people say that the hydro would not work as well on big field as a geared tractor plowing all day , from MY experience with a hydro I would find that hard to believe.
That is just MY opinion from MY experience..to each there own but that is why a hydro is my choice