I've used the mitts,they work good,but check that they do not leave scuff marks,especially in older siding.
The ones I have are black,but i've tied terry cloth around them to omit markings.
Regular stand-offs work good too,because of the need to want to stretch our reach.
Again,check for scuffing.
Usually,set two ladders,one higher than the other on gable ends,with two installers for safety reasons.