Though I can tell they're not as good as they were 5yrs ago, I've still got pretty good eyes, still 20/15 in fact according to the nurse who did my DOT physical last month. With that said, 100yds is about the limit for me with a red dot if I want to hit anything smaller than a diner plate. If you even think you might be shooting at something past 100yds, you'd probably do well to go ahead and get a good tactical scope. Of all the lower power scopes I've tried so far, the Vortex Strike Eagle seems to me the easiest to use. It gives a quick and clear sight view easy target acquisition no matter where my head happens to be in relation to the optic.