Got a mueller quick shot on my mark III 22/45. Love it, love it, love it. I did have an older model for about two years and noticed the rflective glass was loose. Called Mueller, friendly and helpful as can be. Sent it in and they sent me a brand new latest one. No problems.
wisdom comes with time and time is never ending
Cheap optics are just that. In bright light they will either lose their dot or it will be very faint. Not good in competition. Red dot MOA size is listed at a 100 yds. Each time you half the distance the dot gets smaller by one-half. Example:
Other than bullseye shooting you need a large dot at close range. Look at buying a red dot scope with several dot sizes. Maybe a Millet or Nikon for example. 10 or 12 MOA is ideal for competition shooting. Yoy also might look at a C-More which you can buy different dot size modules for seperately. The modules take about 30 seconds to change.
IMHO it's worth investing in a good optic then you won't get frustrated.
All my scoped pistols have Aimpoint COMP XD scopes in 7 MOA or 10 MOA. Unfortunately these scopes are no longer available.
Had tasco red dots on my Ruger .22 and on my .45 for bullseye. Took quite a few trophies with them. I'm sure there are more modern red dots out there, but whenever I go to the range nowadays (haven't shot competition for years because of arthritis) those propoints still put them in the black every time.