This review is not going to be about the ERS as an actual system, but the office location.
It can be quite challenging to get anyone from the ERS office on the phone and messages don't always get returned. (I've had the same issues with emails, too.) Therefore, I've found it much easier to simply visit the ERS office in person when I have a question. If it's a quick inquiry, usually they can get me in to see someone right away. If not, at least I can have a definite appointment time.
When you arrive at the building, push the picture for ERS outside the elevator and head upstairs. (EUTF is also just a quick elevator ride away, so if you need to talk to both entities, it's worth the trip.) Write your name on the clipboard and have a seat in the nice waiting area. (Depending on the time of day, it may be a while before someone even comes to check on the clipboard.) Once you are called, they will ask for your ID and ask about your business there. Again, a small question might get an immediate response, but they'll make an appointment for you if you have a more complicated issue.
They are generally friendly, but there have been times I have found that I have to repeat my question over and over again before they seem to understand what I'm asking. I recommend that you have all your documentation with you if you have a question about something paper-related or discrepancies in the system.
They do validate parking, as they've always asked when I come in, but I'm not sure how the fees work because I have not used the building lot. Otherwise, parking in the area can be very tricky. read more