Review title is Easy to apply.  No irritation.  Great price. [SEP] So far, so good.  I have used many different lash serums, including Rodan & Fields.  I've only used this product for three days and so far there is no irritation.  If you've never used a lash serum before, it is very easy to put on.  It's almost like applying clear eye liner.  Most lash serums suggest putting on before bed at night.  I can never remember when I go to bed, so I put mine on in the morning when I'm applying my makeup.  For me, this works fine.  I just let it dry for a minute and put my eye liner over it.  I have done that routine with this product and it has done fine.  As with the other ones I've tried, I will also be using it in my eye brows.  In three days I have not noticed a huge difference in the length (I have long lashes anyway), but I have also not noticed any irritation or loss of lashes like I've seen in some.  This is also a great price for eye lash serum.