Dual tire pressure equalizer - Anyone use them?

Crossfires have check valves to prevent rapid deflation in one tire from deflating the other tire, however, a slow leak can deflate both tires over time. Best bet is to use a TPMS with a Crossfire installation to minimize that risk. Of course a TPMS is a good recommendation anyway, with or without the Crossfire setup.

They work pretty good to keep the tires balanced. If you have a blowout on one tire, the other tires DOES NOT go flat, or even lose any air at all.

Nope! See it as a disadvantage. What happens if one tire goes flat? Thats right, you now have two flat tires and stuck on the side of the road instead of limping to a tire shop.