This is what I found out about my Strikefire problem.
It is not the Vortex, the problem is with my eyes. It appears that as you get older your eyes change. If you have a astigmatism, you will not see a red dot as a circle. I called Vortex and they were happy to look at the scope but told me to take a picture of the dot with my cell phone camera. If the picture shows a dot, like it is supposed too, the problem is with the eye. I did what they suggested and the picture showed a dot.
I also went to Bass Pro who just started carrying the Vortex. I looked at the one on display and with my eyes, I saw a distorted dot. I also looked at the other red dot's that they had on display and I had the same problem.
Just for the heck of it I looked at a EOTECH. The center dot was a circular dot but the outer ring looked fuzzy or like it was composed of hundreds of small dots.
I played with my Vortex and found that if I turned the brightness down I got less distortion. When I pressed the NV button, I was able to still see the dot and that also minimized the distortion.
So, I guess I have to accept the fact that I am getting old and am going to keep the Vortex. It is a really great red dot for the money. Some of the reviews dinged it for the tight fitting covers and not too user friendly buttons but I personally don't see those issues as a big deal.
One final suggestion , before you buy a red dot physically inspect and look through it before you plop down any cash. I bought mine on the internet without looking at it first so this caught me by surprise.
Hope this helps,