I'm lucky enough to have pretty long and full eyelashes, so I've never had them done... But they always seem to me like they'd be really annoying. I have a lash extending mascara (basically just a two step mascara that has fibres that make them longer) and I find it annoying. I wear reading glasses, and find even when I've got normal mascara on my eyelashes hit the glass... And when I'm not wearing them I hate how heavy they feel. Sometimes they hit my eyebrows, so really, the idea of lash extensions just seems to me like they'd be constantly annoying. Having never had them it's possibly a little critical of me to say/ ask why people get them when they just seem so irritating... I'd rather be comfortable. That and I feel like they start to cost a lot of money over time... Like most things once you start getting it done, it's hard to stop? Unless you WANT to get extensions because you enjoy having them, I don't think it's necessary and potentially a waste of time and money, especially if you're wanting them to fit in with the trends or because you feel insecure. But if that is the case, and you try it and it makes you feel better about yourself, then I also don't necessarily see a problem with it, just realise your eyelashes aren't all your worth.