You asked for an opinion...
I have this system:
Powertank 10 lb The good:
- portable, not tethered to a vehicle (easily moves from a Nissan to a Toyota

)
-installs in several areas
-takes up very little space
-quick fills - 33" tire in less than a minute from 15 psi to 35
-each tank fills 12 - 33" inch tires. Although, I've experienced at least 15 with mine.
-cool factor = +10
-powertank stickers add 10 hp
The not so good:
-sourcing fills in your area. Took me a bit, but I found a local welding supply that fills for $16.
-More expensive than OBA.
-fittings can frost over during longer fills
-when you are out of gas...you're out. Watch your gauges and plan accordingly.
There's a $1.98 to add to everyone else's .02.
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