Michele-- Thanks for posting this! I haven't tried the Trekell, but will now.
Alex-- I've had several Monarchs for years now. . . Gotta admit I haven't take very good care of them-- was using them for acrylics way back when so they no longer hold a point and are sort of old and bushy. . . but they are my favorite blending/pouncing brushes. They've taken years of abuse and none of them has ever lost a hair. Can't remember what they were like when they were new though!