Good firmware but ugly, I already lived in the seventies, I never want to see those colours again ;-) Try a number of different launchers (wind-ups, YAFL, Slubman) and see which one you like. You can simply run them as 'executables' so you don't have to flash your firmware until you decide.
Remember that all the extra functions in the Slubman firmware can be added to other launchers too (you just run them as executables). It could also be that you will like the default firmware. Just try everything for a while.