I was a little weary at first too, but after using the brush cutter option which has to spool up to a good rpm, and as you slice through it really drops down in rpm, I thought for sure it was there was no way it was going to last but the thing just kept on cutting away like butter. Cut down a easy 100 foot long by 15 feet deep by 10 feet high of brush.
As far as swapping out the attachments takes 10 seconds and I change out the attachments every time I use them( wacker part, then edger part) and I have seen zero wear from swapping.