It is worth getting if you are one of those people for whom mascara smudges badly. Mine always ended up beneath my eye by lunchtime, even though I tried lots of different ones. If this is you then its brilliant, doesnt smudge or run or give panda eyes even remotely. Easily comes off in shower by rubbing or with waterproof makeup wipes.
BUT if this isnt really an issue for you I wouldnt bother as it doesnt really do a great deal for the length or fullness of your eyelashes.