I carried one for over a year (2010-2011; my last pump to Iraq) mounted on my M4A1. I loved it. When you compare weights of various optics, 23 oz sounds like a lot, but that includes the integral mount. I didn't notice the weight. What I did notice was unfailing performance, bombproof construction, and really excellent glass. Good light gathering at dusk, dawn, or at night. Good field of view (better than an ACOG). The lit reticle was a nice feature, but I rarely switched it on in actual use. Or even used the reticle. Just went straight to red dot instead for mostly urban environments. My Specter DR was the 1x4 version. Easy to hit with accurately and it maintained zero while getting dragged all around the country on foot, on aircraft, and on convoys. I really liked the 4x throw lever; intuitive, handy, fast, and it just plain worked. Nothing flimsy or prone to breakage/looseness on that scope.
Mine came with a little ancillary Docter Red Dot micro sight mounted high on top of the ELCAN. Where it blocked the ELCAN's integral BUIS. The Docter was tits on a boar. I found it much more useful to just utilize the ELCAN's red dot (exactly like using an M68 Comp) instead. After years of using Aimpoints, my eye just naturally gravitated to that mode anyway. Which was fortunate, because that little Docter sight shit the bed the first time I range fired after arriving back in Iraq. Wouldn't hold a zero and lost ability to manipulate all windage adjustment. Naturally, I binned it. Didn't miss it a bit and I felt the internal red dot on the Specter was better positioned (lower height over bore) and faster to acquire anyway.
I think I changed batteries about twice across a year of daily use. Not because the batteries died, but just to be on the safe side. IIRC, the DL 1/3N N35 military button batteries were good for 600+ hours continuous on at full brightness. Several thousand hours at lower settings. With MK I Eyeballs, I usually used an upper middle setting for bright daylight and a lower middle setting for night. Easy & fast brightness adjustments while wearing gloves and (obviously) NVD compatible. Latest versions are supposed to have a lot more hours and use a more common retail civilian watch battery. So, it's not like a modern Aimpoint where you just put it away for a year "always on". But more like the original M68 CompM2... turn it on when you are on the job and rolling; turn it off for storage.
All in all, the scope worked damn well. I never had a failure of any component. It stayed rock solidly mounted & zeroed through both PMT (Pre-Mission Trainup) & actual Deployment. It was one of my very favorite things. I fired a few thousand rounds out of that weapon/optic combo and the glass was always spot on. It's heavy for its size, but it's quality construction. Like running a BMW M3 on your rail. It's an optic for war, but I'm sure it'd also make a great coyote/deer/hog optic.
The 1.5 x 6 version wasn't yet fielded when I went downrange. I think if I were focused mainly on open country hunting and longer range shots, that'd be the ticket (while remaining effective for CQB). But the 1 x 4 seemed plenty for more realistic 0 - 500 yard stuff.
I'll put it to you this way. The only reason I don't have one for my personal guns is the frightful price. If you get one, I think you'll like it. A lot.