Had a friend that has one out in West Texas. It's a beast! Its a bit more open there so it fits well. The area was mostly single track and sections of technical with long straits. Worked good for him, but I didn't spend time on the bike, but with my EXC I never saw much of 5th or 6th unless it was a road or a wide open creek bed. That thing could chunk some rocks though. You learned to back off the rear wheel.
With 4 gears I'd bet you won't be rowing the gear box much, but if you like to lug it around I'm sure it would work well.
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2013 KTM300XC