Currently have an Eotech, ACOG, and Aimpoint. Each has its advantages. My older Aimpoint Comp M has a crappy detent on the on/off dial and sometimes turns itself back on when putting my piece away in a case. Next time I want it, it's dead. Newer ones have better battery life and maybe better on/off. Eotech is great for CQB stuff and fast acquisition of targets, but I wouldn't want to use it much past the point blank range of the gun. ACOG is great all around sight but mighty pricey, and the BDC reticle is smaller than I would like on my 3.5X. I have the red chevron dot and it's great for precision shooting or fast shooting up close. The Aimpoint is sturdy and precise. I also have a Trijicon reflex on a shorty AR, and it's great out to maybe 200. The Trijicon stuff is hard to beat, I think, because you don't have to worry about batteries or switches. It's always good to go day or night. The cheaper red dot stuff is getting more attractive all the time as the little companies steal the technology. The cheap reflex sights are a nightmare to adjust and don't hold zero well. I've wasted enough money on them to know, but the cheaper red dot Tube sights can be a bargain. I have a Tasco on a .22 and a Sightmark reflex on an air rifle, and they both work fine. I have a Ultra Dot match on my Henry lever .22 Mag. It's mid-range price wise (around two bills), but it stacks up well against some of the pricier stuff, I think. I'd recommend starting with a cheaper red dot tube sight (Tasco, Simmons, maybe even BSA, though I've had bad luck with their stuff) on a .22 and seeing how you like it. I think you will. There's a reason our military is going to them; they're fast and improve marksmanship out of the box. For your battle rifle or pick up and run gun, buy the best you can afford. For me that's a Trijicon ACOG, hands down. A new one I'm anxious to check out is an iTac Mini. Botach Tactical has them at $150, and they look like they might compete favorably with the Mini Trijicon, same size but four bills. The iTac is my next purchase, I think.