If your eyes don't see close things very well, the iron sights don't work well. I was in the snow with my 10/22 to evaluate it again with a scope removed and I can't reliably hit a Red Bull can at 25 yards using the standard carbine sights. With the sights of the 10/22 Carbine model, I have to see a blurry white diamond and line it up with a yellowish front sight. I can tell from the snow flying it is within a few inches, but not accurate enough for hare hunting.
I received the TRS-25 from Amazon. Set up was very easy. Used the cheap Bushnell bore sighter that hangs out of the barrel. In theory I just need to make 2 red dots line up. I've learned that when spinning the bore sighter (pushed back against the barrel), the red light makes a circle on the wall. So I spin it to find the top and bottom of the circle, and stop the red light at the middle height. That is my Y coordinate. I set up the elevation to match that. Repeat for finding the middle point between left and right extremes of the circle. That is my X coordinate. I set up the windage to match that.
I took it to the range, and this produces hits about 2.5 inches off center at 20 yards. I adjusted it once, and now the shots group nicely around center.
I like that there is no parallax - the red dot stays in the same place regardless of eye position. I also like being able to easily shoot with both eyes open. I've heard people say that you should shoot with a scope with both eyes open, but it doesn't work for me aside from the red dot situation of having no magnification.
The only possible down side I can see, is in mild snowing conditions where the snow sticks to the metal. Then I will use my Marlin with Williams Fire Sights. At first, I was going to do the same with the Ruger, but I had difficulty finding them available for the 10/22 in Canada.