Brow Define is the only product I use on my eyebrows now because it's so easy and lasts all day. The crayon itself is very thin so I can fill in and shape my brows without overdoing it and the spoolie on the other end is super handy for grooming. I've tried other pencils that look great at the start of the day but slide off my oily skin, but this one is so much more longer lasting!
Ever since big brows have been in, I've been erring more towards buying products that make my mornings quick and easy. I really like using things that allow for precision - which this does anyway - but what I really want is something that just gets the job done asap.
The angled, waxy crayon allows you to fill in your brows quickly and easily, and is a good size is you have any larger sparse areas. Because it's angled you can get a precise line. Though my preference is for spoolies that don't contain brow gel, this is actually an extremely good brow gel. It's not too wet or too fake looking, and you can use it to comb through the waxy product too if you want, without it going everywhere.
I've become weirdly fussy about brow products since I found my HG a few years ago, but this is and the other brow product from Eye Of Horus are both five stars for me. Which one you get really depends on what your main concerns are - if you want something quick for every day get this, if you want something more for precision get the Brow Define instead.
I'm actually pretty hard pressed to work out which I prefer, the Brow Define or the Brow Duo? I think this one is better if you just want to fill in a gap or two or refine your brow tail. I like the spoolie that comes with this - super convenient, and not too hard.
Personally I hate having to worry about sharpening pencils and this one is also the perfect size. It's not too hard or too soft, and its easy to get brow-identical hairs. Colour range is great too!