nah, i'm going to call this one quits.
as storl said, the reticle may flicker when the battery loses connectivity with the leads. in my case, the sight is a little difficult to maneuver for battery changes. nothing too complicated, use an allen wrench to unscrew two screws, then the whole top of the sight lifts off. it does not come off all the way, and from what i can tell there is some sort of elastic holding the back end down. i will not tug on this for fear of damaging the device.
so i just slid the old battery out and slid a new one in place, within the small gap that was available.
all things considered, the battery life isn't bad.
again, left it "on" for 46 days, medium brightness.
the reticle flickered or went out when i was firing .22. i would jiggle the on/off switch from off--high setting, and the reticle would come on again. it's fair to say the battery was on it's last leg.
replaced it with a new CR2032 and the sight comes on just fine again, no flickering, and the operation is normal.
would i recommend this sight?
sure, i mean. it's not bad. does what it's supposed to do. it cost me just under $100, IIRC. given a chance to do it over again, i'd have gone with the brand "ultraDot." heard better things about them, overall better reviews. they are slightly pricier than the sightmark i have, but all within reason.
nc527, you can find them here for that price.
http://www.midwayusa.com/viewproduct/?productnumber=333722
i have heard of the models you were talking about-- the ones with light sensors, that would come on when you removed the cover. mine has a switch, with a "med" and "high" brightness setting. the switch is kind of cheap. but all in all i think the switch model is the upgrade over the light-sensing one.
kk guys, hope this helped.