One that did for me is that I've always been very critical of the price tag of Eotech optics. For those who don't know, Eotech has long been the only name in the game of holographic optical gun sights.
What irked me a lot was the price on them, they range from $512 to $800. Holy cow, is that insane for an optic, considering the Sig Sauer Romeo 5 red dot sight can be had for $100, and the Bushnell red dot sights can be had for under $50.
The military has been singing the praises of Eotech optics for a long time as well, despite their very short battery life of under 1,000 hours, while the Romeo 5 has 50,000 hours of battery life.
Holographic sights are much more complex than red dots, and require several lasers to make them work. Tests done regarding parallax shift has shown that Eotech sights are far superior to red dots, but that still leaves the battery life, and the price of them.
A year ago, I saw a good deal on an Eotech 512, and they offered a payment plan in which I would pay for it each month, for 12 months, with no interest. I decided to go ahead and see what all of the fuss is about.
I use it on my PSA GF3, with a midwest side rail. Using it at the range many times has shown me why people are willing to pay so much more, the optic is absolutely phenomenal, and not to mention it's incredibly cool. I could be looking at the sight from a whole foot above the optic, and the point of impact is still surgically consistent.
And as for the battery life, there's no need to keep it on all the time, and changing the batteries takes 8 seconds. I've also heard tales about it's usability with night vision, but It'll be a while before I can afford to experiment with that.
The price of optics only matters when you have several guns. A $2500 Elcan is cheap when you only have one. I swear Garand Thumb is low key bad for the culture.