I assume you're talking about the power trimmer?
I have one and it trims very well. You have to run a vacuum cleaner to suck up the shavings, which can be loud and annoying, but it's not as annoying as trimming by hand. It's very, very fast. Trimming becomes a non-issue and requires no effort other than cleaning a vacuum cleaner bag.
I do brass prep and the actual loading seperately. I did my first batch a few days ago, after sizing/decapping/trimming, I threw them in the tumbler to get the lube off. Lo and behold, the tumbling action deburred the mouths. The trimmer leaves the mouth so clean that walnut gets off the very minor burrs that are left. The mouths look like factory, except there aren't any machine marks.
I haven't loaded any live rounds from this batch yet, but some dummy rounds still seated fine without any proper chamfer/deburr. There was no noticeable difference in seating or crimping with some I chamfered manually. I think I may skip the chamfer for a few hundred rounds and see what happens.