I wouldn't give retail for one of the Gen2 Armasight units, BUT if you're getting a deal on a clean used unit, they're not bad...
I have a Gen2+ White Phosphor CO-MR Armasight unit that was my only clipon for a few years. It's a little limited but certainly useful. I've moved to a Gen3 PVS-30 as my primary but the Armasight still gets use when taking friends hunting and they get quite a few hogs and yotes with it. Here are my thoughts:
1) Definitely get a good IR Illuminator - it makes or breaks a Gen2 unit. I use a TNVC Torch Pro II (often with a 3x PVS Magnifier) and it can turn useless conditions into kills.
2) Don't have unrealistic expectations. I think my longest kill with the Armasight was just under 300yds (coyote) but that was near ideal conditions (good moon, illuminator in play and contrasting background). I can't count the number of hogs, yotes, skunks and other varmints inside 200yds, though.
3) Specific to the Armasight unit - I actually like the build of the units. It's rugged enough that I hunted with it for a couple years and it's still like new. The controls are simple and functional, the focus function works great and is simple, as is the gain control. The included remote fob is a nice touch that I wish my -30 had. It's light enough without feeling like a "toy", when I'm using it on my suppressed .22 bolt gun (no rails) I can attach it directly to the objective of the scope no problem. It's very compact as well compared to a -30 or similar.
4) Gen3 IS a true generational leap in performance, BUT it's a generational PRICE leap as well. However, if size/weight aren't a huge factor with the type of shooting you do, you can likely get into a G3 AN-PVS-9 SIMRAD for less than the cost of a G2 Armasight and have extremely high performance.
I've been hunting coyotes all week with the -30 and REAP-IR. Tonight I'll bring the Armasight along and get some thru-the-scope pics side by side with the -30. It's open fields with cattle scattered around so distance comparisons should be informative.