Yeah buds have to be on the crispier drier side forsure, and for me it was a $1.50 or whatever cost to try something that changed my opinion in a hurry.
does one still need to fine tuen with soem scissors later yeah but when buckign down into buds off the stem it makes quick work.
and honestly made my buds probably better trim wise as i always trimmed on the loose side as to me it was more if it has thrichomes on it really no need for me to trim for appeal when just for myself.
Definitely worth spending a couple bucks at a dollar store, to trim down a brush to try, just have to have buds on that drier side for it to be effective.