I have a 1.5-5 Illuminated duplex with the 30mm tube. Seems like a good enough scope, though I haven't subjected it to any "hard use". Not sure I'd trust it as much as my ACOG.
Optics are about on a par with my ACOG TA01C, and if you sight it the middle of the x-hairs at 100yds, the bottom of the thin lines is on at 300, and the point at the top of the thick "post" is on at 400. Haven't figured out any ranging tricks with it yet, but the MOA for those two ranges match up with my ACOG perfectly.
Not on a par with a 3-9 MR/T, but it's just a touch more than half the price. I'd say it's a plenty good alternative to the ACOG if you can't find/afford an ACOG. IF it will hold up to field conditions like an ACOG (which I kinda doubt) then it would be better than an ACOG because of the variable power option and slightly higher magnification. One tip - use a Larue mount, or put it on an extended rail of some sort so you can get it forward enough for proper eye-relief.