This was the first product I ever bough for my eyebrows, and its sooo easy to use! I use "light" for my light brown/ashy blonde haircolour, and its a pretty good match (although sometimes it can appear a bit dark if I put a bit more of the gel part on).
The brushes are ok. The one for the gel part is a bit tricky to use, but not bad, and the other one is a bit too thick to use it properly. Once you figure out the brushes, its easy to use, and gives a great result without looking like you have painted on eyebrows :)
The elf brow kit is very useful because i can make my eyebrow look naturally filled in and i can also make it bold and dark. what i dont like about this kit is that if you are not using the right technique to apply the powder/gel then you gets parts of your eyebrow which have a more solid colour and parts where its very faint.
Tips: brush your eyebrows before and after you apply the kit. if you have an angled brush try to apply the power/gel onto your brows with that and see if it makes a difference to the brush they give you