The UI of elastic apm makes it easy to understand what exactly our app does, how well we are doing in terms of user experience etc., It also gives us insights into problems faced by users which helps me take corrective action quickly if required. I like that its simple enough even as newbie i can use without much hassle or learning curve involved! No major dislike so far but yes there could be some improvement when you have lot's of logs coming from your server side code base (which sometimes goes above 10k). We had issues with slow response time while loading pages due to high number of requests made through API calls at once. Also this was not visible till we used ELK stack log aggregation solution provided by op beat.