I initially started using eyebrow mascara from a department store brand, and later tried out various drugstore options as they became available. I found the price and color selection to be the most satisfactory. I generally enjoy lighter hair tones, and the eyebrow mascara helps to tone down my naturally dark brow hairs even when I don't have lighter hair.
In the past, there were only two color options, which was a bit disappointing. But now the selection has expanded to 5-6 choices, which is great.
However, the brush can sometimes pick up too much product, leading to clumpy brows if applied multiple times.
Also, when using a lot of the 'eyelash serum' type formulas, it can make me think of helpless flies or mosquitoes - I'd recommend using only a small amount and brushing it through lightly. (For reference, the 'brand X' formula doesn't clump at all, even with heavy application, but the price difference is...)
The recommended way to use eyebrow mascara is to brush against the hair growth first, then brush back in the natural direction. But that method didn't work well for me, as I have very thick brow hairs. Following the recommendation led to perfectly pigmented brows, but they ended up looking clumped and unnatural. I've found it's better to let go of that approach and lightly brush the product on in the natural direction of my brow hairs. While it may not be as intensely pigmented, it's a more long-lasting and natural-looking way for me to use the product. Despite that, I still find the eyebrow mascara to be a great value and will continue using it.