you can't shift between ranges while moving but you can shift any gear 1,2,3,4 within the range H,M,L. I can't speak to holding up as I've only got 40 hours on it so far. I have had issues with the TPS and the scavenger pump switch. Run it at the dealer and check to see if the warning light is blinking, mine was but the dealer didn't address pre delivery as I had requested so I had to have another local dealer come out, charge me road time as he wasn't the selling dealer, to replace the part under warranty but I digress. This isn't a rant about lack of support and crappy dealers that call Mahindra to cover their asses when you say your gonna call corporate. What are you looking for in a machine? I love the strength of the unit but sometimes wish I went with the smaller hydro to do more precision movements vs clutch. it's also a giant so be sure that it fits in your barn if you got one....My monday morning quarterback move. Despite the glitches and afterthoughts I've had It's still a great machine that I really enjoy. I don't know ground speeds but I mow in 4th low. The one thing I don't like is the lack windows forcing you to always use the vents. The rear window opens but for side ventilation you'd have to leave the doors open.