If i were to go with a mechanical trimmer. I would just op to build one and id just go with a dry sift tumbler. But some of those wet trimmer setups aren't too bad. i just think its overkill to do both so for the wet trimmers id just stick to cutting off big fans and id personally go a dry tumbler setup. I prefer to hand trim and enjoy it. but honestly, it hits the point id be ok with tumbling 80% and keeping 20% of the good stuff to trim that's the top colas by hand or whatever. I in no way like trim bowls. I think they could be useful if you are like a dry to smoke grower and don't really have time to trim and are always in a constant grow/dry/smoke cycle. But short of that those are too much damage and i draw my line in the sand personally at the dry tumble trimmer setups. Not so much the trimbag cause i don't like mixing bud that much. but its pretty awesome if you were highly commercial.
Logic being at least with the dry matter from tumblers you can sift it for the kief if you are worried about that. :) or even make a pollen tumbler to tumble the trim and extra matter :)