1/2 cordless impact opinions

I bought the Dewalt 1400 ft lbs removal. It was recommended by a friend first time use I tried it on a HD truck to see if would remove the lug nuts. Worked ok. Used it about 3 more times and no torque. Going to send it back and see what happens. I also have a 1/4 makita works great. 18 volt. Will not quite break car lug nuts loose but dam close.