I don't have the 3-9x, but I do have 3 Sport Dots, the 2-7x, 3-10x and 4-16x, great optics, I have 6 Muellers total, the 3-10x44 is on my second 280 Barrel now, it was on the original before I rechambered it to Improved. The 3-10x developed a slight amount of moisture on the inside of the objective lens, not enough to affect the view, but you could see it in the flare if you got just to the edge of the eyebox. I've had it for 3+yrs, returned it to Rich at Mueller, he sent me a new one-piece tube model the next day. I'm thinkin real hard about ordering a 8.5-25x44 Tactical soon, I've been real impressed with Mueller Optics since the very first, they've never let me down, nor have I seen their Customer Service disappoint anyone.
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Tim