I've had the M35A2 and loved it, But I like my 5 ton M923A2 better! More room in the cab, Power steering, conventional 8.3 Cummins instead of the obsolete LDT-465-1C, Air brakes, Bigger tires 14.00's on mine, 70+ MPH!!!!!, better fuel mileage, and it's bigger than the M35! It does have a auto in it, I'd rather have a stick but at least it's a mechanical Allison auto. CTIS is a pain so I removed all of mine.
I took my M923A2 to Hatteras this year. We went out of Ramp 49 (Frisco) for a week never had any issues