I do not own one, but I have seen posts about them here. Complaints are that they are not true Holos, just a conventional red dot made to look like an Eotech, they are not bright enough for outdoor use, don't hold zero, and blink under recoil. Some people have said they are good enough for range use, but personally, I would go with the better reviewed Aimpoint style sight from Primary arms, as stated above.
Primary arms also has a real Aimpoint for $369, or you could cruise the sale boards. If you have your heart set on an Eotech (that's what I use) they can be had for as little as $350 new, and High two-hundreds used.
If you are on a strict budget, but want a good sight, remember that if you spend $90 on a cheap sight, and then spend $400 on a good one a few moths later, you have now spent $490 on a good sight, and have a useless paperweight.