Super simple to incorporate in my web projects. In fact, they have some customizations made specifically for our needs (e.g., rounded squares with different sizes). There are no major downsides, but sometimes I would like that I can change the color of the set's background color. It really helps me when designing UI prototypes to quickly provide a design mockup without much effort. The support team has been amazing - they reply super fast and we've been able to solve all of our questions so far. We're currently working on an e-commerce platform built using React. One goal was to provide our users with a really good UX experience, so we decided on replacing our original logo with a simplified version of the Smashicons style. The size of this pack (14k) allows me to use it in my app without any problems, I can change colors as well! It's free so there isn't anything bad about that either :). There are some missing characters but they will be added soon :) Hope you'll like them too ;) You should definitely try out their other packs because all of those have more than enough content. This one has only 1296 images which makes using very easy at first time when starting your project or making new ones.