It's probably better to just break the nuts loose by hand, and definitely better to final-tighten them with a torque wrench anyway. Especially if you're frequently removing/replacing/swapping wheels.
It's getting time for me to upgrade my own cordless impact (~10 years old) that way too optimistically claims to be good for 200 ft-lb What is likely to be the top consideration is how well batteries on any of these Dewalts/Kobalts/etc. retain their charge over periods where the tool doesn't get used. What I've got works fine for most of my uses when it is charged, but it's a PITA when two weeks after charging them, both batteries are flat yet again.
What's anybody's experience with the batteries for some of the brands mentioned earlier in this thread holding a charge?
Norm