"Think that these are the same things as the Smittybilt tire deflators (knock off on Staun). These run $40+tax at 4wheelparts.com compared to $69+tax for Staun. You could pick them up in person in Westminster or Aurora (?). You can also get them for the same price without tax and free shipping at Amazon.com.
I don't know anything about this product, but these are even cheaper at $13, but $20 shipped,
http://www.amazon.com/Quick-Air-Tire...=pd_sim_auto_2
There has to be a local source for these at $13+tax."
These work, but like Jon said, the Stauns do it automatically. These you have to monitor the air pressure and the Stauns you preset and forget. Also, like Jon said, these are available at any 4x source. What you are paying the extra $$ for is the 'forget it' part. The Chinese take offs are similar to the Stauns, the Monster valves and two or three others in this aspect.
I have these and the Stauns and find myself using the Stauns for the harder trails where I am airing down to below 10 pounds. I have the Stauns set at 8pounds. The ones you list I actually use the most as I run most trails at 16-20 and don't feel like resetting the Stauns.
You are supposed to be able to just put the Stauns on and leave then on for the duration of the trail run. I don't do this, nor do I know anyone else who does. I think it is because they cost so much that losing one would be a PITA....
Personally, I wouldn't have bought the Stauns as I don't mind airing down, bending over, etc and the simple $13 ones work just fine. The Stauns were a B Day gift. If there are enough people interested in purchasing the Chinee take offs, by all means get them. You will like them. If not, then the other ones are a good choice.
I just posted a good bit of information and a link to a tire inflator comparison review in the 4x4 Tech Topics. Here is the link:
http://www.parksoffroad.com/prodrevi...flatormain.htm