I love this product-- WHEN it works. I build and build with the fibers, and I can literally make my lashes touch my eyebrows-- with a lot of time and patience, of course! The downfalls: Sometimes works, sometimes just doesn't-- they're fibers, they go where they want to and sometimes you'll get 2 LONG lashes, and the rest are short fat clumps. There have been a few times where I have found myself very frustrated. And how the fibers fall all over; they even manage to get up on my forehead! The last thing is that it makes your lashes clumpy-- b/c they're fibers, they go UP and OUT. There's no way around the clumpyness, so if you can't handle clumpy lashes, don't waste your time or money.
So, if you're trying to build really long lashes, you have to have a LOT of time set aside and patience, and be prepared to get frustrated. And if you hate clumpy lashes, this IS NOT the product for you. But it does work!