"The only thing I’ve noticed is that they can look a bit orange in the sun when you use plain old Jolen bleach."
This is definitely true, although it's not stopped me from using jolen! It's so much easier than actually plucking your eyebrows, just simply dyeing them is hassle free. It does get quite annoying when the bleach wears out after a month or so though.. but maybe that's because i have really dark eyebrows.