The user interface of knowledge pay has been very easy to use for everyone in our organization, including new hires! It allows us all access from anywhere with an internet connection which makes it great when we are traveling or out at conferences/meetings etc.. There isn't much that I dislike about this product but one thing would be if they had more flexibility around their system like allowing employees time off without knowing until after hours (in case you need them). We have found benefits such as vacation savings through using Kpay instead paying manually every month - plus tracking payroll taxes & FICA's easier than ever before!!