The only downfall of this eyeliner is that the product in the case dries up so quickly! It lasts for ages but then you have to buy the Duraline liquid drops to help the product become less clumpy and thinner. You can also use your MAC Fix+ to thin out the product as well but it doesn't work as well as the Duraline. I use the Inglot angled brush to apply the eyeliner and sometimes if I want a perfect line, I use my MAC 210 brush.
A trick I learnt was that every time I use the product, while applying my eyeliner, I turn over the case upside down so it doesn't start drying out as quickly. To remove the eyeliner, I use Lancome makeup remover. This eyeliner product is difficult to remove so it is absolutely smudge-free! Even during this heat-wave the eyeliner does not budge.
Definitely a must buy!