Not a pro, but do own Hutchins DA & inline sanders, they are worth the $$$ paid, heavy and well built.
A few things to mention that are worth noting, quite and toque. Speed can be adjusted on the fly, speed em up, removes filler quickly, slow em down for fine feathering.
And last but not least, will not be disappointed with the performance. I as the DBM, have owned them for 15 years, used for body work and wood work.
Hope this was helpful