Speaking from the perspective of one who has lousy eyesight and had worn glasses for 40+ years, dots are a godsend.
Don't make the mistake of buying a cheap dot, been there done that. the cheap ones have an unbelievable amount of parallax. I pointed that out to a shooter last Wednesday at the range. He was struggling to hold a 6" group at 50' with a Ruger MKIII with a huge dot (the dot housing must have been at least 40mm). I watched him for a bit and his form wasn't that bad. I laid his pistol down on the bench and while watching the dots relationship to the target, moved my head from side to side and up & down. His dot had over 5" of parallax at 50'. I grabbed one of my Ruger's with a 1" Ultra Dot and laid it down beside his and had him do the same thing. I had him shoot mine and his group went from over 6" to 2" with basically the same gun, just a different dot. I've looked through a lot of dots and the best have been Ultra Dots and Aimpoints. I've currently got 7 UD's on everything from 22's to 45's.
The durability of UD's is excellent. I had one mounted on the slide of my main 45 wad gun that went over 35,000 rounds before I got too nervous about taking one with that many rounds through it and replaced it before I went to Camp Perry in 2007. It is still on one of my 22's and has never failed me.
Now for the reflex, I do not own one. I will share what I have learned about them from other shooters. Most do not have click adjustments and as such are difficult to change zero's, some require removal in order to change the battery. Not an issue with casual plinking but can be a bad thing when switching back & forth between 25 and 50 yards for Bullseye. They are an advantage for other shooting disciplines that require a larger field of view and don't require zero changes.
I normally order mine from Larry's Guns, I have no connection with them other than as a very well satisfied consumer and they have very good prices.
http://www.larrysguns.com/
Am I biased, yes. I hate seeing people throw good money away if it isn't necessary. Whichever way you go, don't purchase one without being able to look through it and check the parallax.
FWIW
Stork