Hello. Thanks for considering our kit. We are the manufacturer of the coolingmist kits but I will be glad to give you the understanding of our kits and how they work.
One of the things that seperates our kits from all of the others is the controller. The CMGS gauge is all in one and has a flow sensor based failsafe included. When you consider that, our kit costs significantly less than any of the others you mentioned.
The gauge will show you the flow rate. In addition to that the gauge will show you your boost pressure. Also, you can set up the CMGS to turn on/off any device based on low flow, high flow or low fluid level. For example if you had a turbo with a boost controller and you get a clog or your pump fails or you have an over flow situation, you can make the cmgs turn the boost controller off so you drop to lower boost. Thats just one example.
In addition to that, the screen on the CMGS will tell you if there is a problem with error codes. You will know ours is working. Since its a gauge, its easy to mount.
Here is our wiring diagram. compare to the others.
Here is a simple video showing you how easy and exact setting the MIN/MAX on the cmgs is:
http://www.coolingmist.com/videos.aspx?videoid=2#video
As far as tuneability you can debate as to which is more tuneable the CMGS or the Snow unit, however with the cmgs you can:
Inject on just boost or just voltage or boost and voltage. You can set the % on the curve, change the min/max dutycycle, etc. its quite capable.
I believe that as a customer you should look at the features of the kit and make a decision on what you want based on what you need. If that turns out to be one of the other kits, thats great. Keep in mind that Coolingmist and JRE support this forum. Also, you can order this kit from JRE and they have installed this on more than a dozen camaros and they can tell you anything you want to know.
Let me know how I can help you. You will not regret your decision if you choose ours.
FYI, if you like the AIS tank, you can order the tank by itself and use it with our kit. They use the exact pump that we do.
CM