I am also looking forward to trying out the Frankfurt S-Bahn.
Since ToD4, Free Roam, changing stations and routes and various other features have been implemented, as well as of course several new trains (and there are still quite a few to be added, such as the 151, 140, ICE 2-4 etc. etc. etc.), i spend hours and hours at the TSW.
And I have to tell the truth, often even just as a passenger.
And I am very satisfied.