If it's appropriate to the weight and bulk of the gun, the Aimpoint Micro is hard to beat for performance and features, and the Burris FastFire seems to be a good value, although I haven't put mine through the wringer. I've found that, because I apparently have some degree of astigmatism, the red "dots" are misshapen, appearing like cartoon "voice ballons" or sperm cells, not perfectly round, and with little "tails", which is not a problem, particularly at handgun ranges --- you simply cover the intended point of impact with the bulk of the dot, or use a six o'clock point of aim, and ignore the aberrations in the dot's image.