ADP has some of the worst online offerings. In order to see my paystub or signup for health coverage I use one site. To request time off I have to use a different ADP site. Both have different usernames and passwords. Both sites look like they were made in the IE 5/6 web development drought. I have no real complaints though with how everything actually works though, never had an incorrect paycheck or messed up PTO.
Sigh.