Ole Bally: The size and brightness are under the purchaser's control pre-purchase. EOTechs in my experience have 1 MOA dots, and a ? 65 MOA circle, or two 1 MOA dots. Mine are all 1 MOA dot in a circle. I use the same reticle, approximately, in the illuminated VX3 1.5-5 Leupolds on two guns. I wish I could say that a 1 MOA dot was a problem for me, but no. I use a Trijicon RMR (LED-powered small RD) on a pistol. I don't like it -it took me ages to get over "hunting the dot" on the RMR. There is choice of dot size in some models, not in others. As for battery life, that's long been the biggest complaint about EO's, but given the cost of 375 H&H cartridges, stocking CR123 (or AA lithium) batteries just never bothered me a bit. I keep spare batteries at hand and change them when the "five days left" blinking starts...or sooner. In recent EO models the battery life is good. Certainly EO batteries will last longer than 99% of safaris.... Since I use EO's for lots of purposes (from action-type competition with 223's, even on shotguns (not for wing-shooting!) to heavy bolt guns in bad weather or close-up 'speed counts' hunting) I'm openly biased. Make sure you get views of people who use the Trijicons and Aimpoints. Many people love them. I use VX6 scopes on my rifles normally.
I'm sorry I can't quickly find it, but one poster recently put up a photo of himself on this site in front of his downed elephant, cut off tail properly in hand, and an EOTech on his rifle.
Julian: I use the old Leupold 1.5-5 illuminated 24mm 30mm tube and like it. It has held up well. I prefer circle dots, but am slowly being pushed to 'firedots.' I think people develop habits, biases. I've got mine. I carry a backup non-illuminated 1.5.5 heavy duplex Leupold often times, because it's bomb proof and light. As for the value of the circle dot or firedot, I think it is real...it helps speed the eye to the focus. People's experiences vary, but I think the value of an EO (or Aimpoint or a firedot) is exactly when your quarry is wounded but not dead, and you'll pay for the animal either way, and the light is fading...or the animal has simply become more dangerous than ever. I don't know the views of others. –In this day and age for a DG rifle I think your choice of HWS or red dot (shop carefully) and a thrifty 1.5-5 or 2-7 scope, a pair, makes a lot of sense for a DG rifle, because few of us use metal sights with the skill of the pre-scope generations. Some do, of course.
I'm not the most experienced at four-legged dangerous game, so take my views with a grain of salt. I nearly always carry an EOTech in my day bag, even if its a scoped day. I put everything on weaver mounts and quick release rings, zero the EO before hand, and I'll pop the scope off in an instant if I think the balance has shifted to fast, close-in, or dangerous priority, or if weather or darkness counsels it. There. I've probably said more than you want to read. Laugh.