I drove a HST XR3037 this morning. It works pretty neat. (My first drive in anything HST!) It goes when you push the pedals, and stops almost immediately when you release. In low and med range, it was very capable and easy to control. I was on a slight grade, and bumpy ground, and high wasn't so ideal. I think it must be more of a road speed. I'm sure using the correct range for the task is important, and med seemed about right for most use. I was surprised that it would skid the tires if you were moving with a lot of pedal, and released it quickly. I expected a lot of roll, but there was really none. It was also nice that the brake pedals were on the left, so you could actually use them. Seems I've seen a few HST's with brakes on the right, which means you can only use the brake if your foot is off the HST pedal(s).
I was also impressed with the size of the XR3037. It's a pretty big tractor!! It also has the steering ram behind the front axle, but only has one ram, with a tie rod to the other side. The tie rod is in front of the axle...
I also drove a XR4150 TLB. It was REALLY nice!! The only negative I could come up with is that the shuttle lever is kinda short, and doesn't move back when you tilt the wheel back. You have to kinda lean forward to shift it, and being so short, you have to push kinda hard on it. I got used to it quickly just messing around in the yard, so probably just different than the MF I've run, not necessarily bad... I also noticed that the front tires (AG) rubbed the loader mount a bit at full lock in both directions. You could see the rub marks, and hear the treads going "fup fup fup" as they snagged and let go. Wonder if the Ind tires do that too?