I own the Uview AirLift 550000, and I also own the Astro Pneumatic 78586.
The airlift works good, but I have 2 complaints.
1. When the airline is attached, it constantly uses air even if the shutoff valve is closed, because the air line plugs directly into the venturi mechanism.
2. The rubber fill neck rips fairly easily & will cause air leaks back into the system. Finding the replacement part is NOT easy & I had to resort to finding a reseller on ebay to replace mine twice.
As far as the Astro Pneumatic one goes....
I have not owned it nearly as long as the Airlift, but I have had zero issues. I know it is compatible with their line of radiator cap pressure testers & is part of a larger set that includes everything if you wanted to go that route. The best part in my opinion with the Astro version is that when you turn OFF the air to the venturi, you dont still use air....the flow stops, because they were smart enough to place the shutoff valve BEFORE the venturi, not after it like the airlift.
So to sum it up...
The Airlift is a great system, aside from the air usage annoyance & the ripped rubber fill neck. The Airlift is more expensive ($115 or so)
http://www.uview.com/index.cfm?DSP=...oryID=1330&pagepath=Products/Cooling&id=45700
The Astro Pneumatic version is great, I have had no issues, but I have not owned it nearly as long or done as many fluid changes with it. The Astro is much cheaper ($65 or so)
http://www.astrotools.com/default.aspx?toolsnum=78586
I would buy either again with no hesitations.