I have found lots of helpful and useful information on that site.
I tend to go to Online Chapel - Greek Orthodox Archdiocese of America or use the Daily Readings app from GOARCH to guide my prayers and check daily readings, since I belong to a Greek parish, but I do like the OCA site.
Our little Community is made up of Greeks, Russians , Brits, Romanians, Asians etc etc so when checking for Tropar and Kondak I tend to see what is on both Sites and then work from that. As I normally Read Third Hour before Liturgy on 3 days each week - I do need to know the correct 'Propers' to take - it can be fun working things out.