I own several of the C3 cordless tools. I'll review two of them:
The cordless impact wrench (#17090) is one of their best tools. For a cordless impact this thing can bust the lugs on all 4 wheels and put them back on while using the same lithium-ion battery. I'm sure it can handle another 4 tires. No need in dragging out the air hose and compressor.
The cordless inflator (#11586) impressed me this weekend. I've used it to air up my tires on occasion. But it was put to the test when airing up 4 tires from 20 psi to 30 psi. Sure, it may have taken 15 minutes, but the inflator allows you to set a certain psi and put it on auto and walk away. Very convenient.