If you have noticed, the T110E4 has a higher traverse speed and speed limit compared to the T110E3's. The T110E4 has a turret making it more lethal at close range. The only downside to the E4 is it's reload speed which is not a problem. I think the E3 should have a slightly better traverse speed and speed limit (like 25 traverse and 28 speed limit) that way it stands as a closer equal to its E4 brother.
The cruise control is glitching to where you have to press the key continuously to get it to the max cc. Sometimes it all out doesn't work.