It's the next red dot I'm going to buy.
The Holosun with the motion detection actuation is a little more money and frankly, I don't like the feature as it's just something else to break IMO.
My understanding is that they are all made by the same mfg....there's an even cheaper branded one that retails for like $150....that is the same as the Holosun. I can't remember the name though; my buddy bought one and it's been great so far.
Reading the reviews...sounds like there have been a few minor problems with occasional lemon units that were resolved by shipping a new one....but it looks to be rare. For the money....they seem to be a great deal.
I personally wish someone made a model like this one: Primary Arms Micro Dot With Removable Base - MD-RBGII - Primary Arms that has the on/off and brightest settings/battery compartment like a real Aimpoint...but with the 5 year life span.