I briefly operated a BCS 770 at Wes Stauffer Equipment in Ephrata PA last week. Very nice tractor. Shifting direction or speed up or down does not require the use of the clutch and shifter rods and is much faster than a 749 or 853, both of which I operate. Shifting from forward to reverse (and vise versa) was also faster but not as fast as I hoped. I was advised to shift through each gear slowly to reach neutral and then into the opposite direction. Each speed has an easily recognized detent but neutral is difficult to recognize. I am sure this would not be an issue with more experience behind the handlebars.
The tractor also has a low and high range that are shifted between in the traditional manner using the clutch lever and shifting rod. Low range is lower/slower than 1st gear on a 749 or 853. Not sure if high range is any different.
This machine is more money for sure but it is so much easier on carpal tunnel sensitive hands and is easier and faster to operate than previous models.