I'm going with North Country Gal on this one. I've got an UltraDot 30 that I had on my 22/45, but that I've since moved to my 10/22. It completed the rifle perfectly and it's my favorite plinking gun of all. Armed with a box full of CCI Mini Mags and my 10/22 + UltraDot, there isn't a tin can, tiny pumpkin or potato in three counties that is safe from me. Muahahaha!
The UltraDots are well-made, highly durable and very accurate. I find my UD dot to be far more than adequate in size, shape and consistency. Bright enough for daylight use, but can be turned down for dawn or dusk shooting. No fancy bells and whistles. No weird reticles, no green or blue or purple. Just a red dot that is accurate and consistent.