I love the Burris Fastfire sight. They have unlimited eye relief, unlimited field of view and at one ounce they probably weigh less than the adjustable open sight they replace. They have nothing to turn on or off, just remove the hood, point and shoot. I attach the hood to my holster with a short leather thong so that it pops off when the gun is drawn and it doesn't get lost. I've tried scopes and full tube red dots and find a handgun so equipped is no longer a handgun. They're very accurate if you have all the time in the world but quick point shooting is out of the question and the limited eye relief doesn't fit my long arms. They also add a great deal of weight and bulk to the gun and require big bulky holsters. I now have three handguns equipped with the tubeless red dots, a Burris fastfire on my AMT .22 mag, a Dr Optik on my .357 and a cheap Chinese version on my S&W 22A and I really can't imagine going back to irons.