I started using Latisse about 3 weeks ago. I'm starting to notice that the hairs at my lash line are filling in. It looks like I have eyeliner on, only it's dark because of the new lashes sprouting up. And, my lashes are getting a bit longer. I haven't had any irritation thus far. (fingers crossed)
I use the brushes that come with the kit. I use a drop or two to coat the brush. I find the brushes are a bit thick, so I use scissors to thin out the amount of bristles. Also, I tried Dea Bella and had NO results.