It's very easy to use, they offer many different types off tests for your website or app in various categories like UX/UI design as well if you need multiple people reviewing it at once there are plenty options available with them too! I haven't found anything yet which we disliked but since this service has been around long enough i imagine some things may have changed over time - so be sure make yourself familiarized by reading about all its features before signing up :) Our team uses user testing services mostly when working remotely from our home office (i'm not allowed near computers lol)! We usually do usability testings either during early development phases where most problems aren’t discovered until after launch date OR sometimes later down the line while launching new feature updates / improvements etc..