It helps in knowing if your website visitors are interested or not which really help to improve overall experience of our customers visiting our site. I also like that it's easy for non-techies (like my boss) to use when he visits websites with me. There isn't much you can dislike about eyesdecise so far we have nothing! We've been using this tool since few months before now & haven't faced any issues yet but there could be something wrong somewhere at some point maybe? But i don't think its that big an issue unless someone uses their account as well from another computer/browser/ip etc then they might face problem with logins / password resetting.