+1 .. I do think these IRS and soon to be IFS F1 are doing pretty well with the 104's . last sunday I ran mine at TQ . starting last and finished 4th in the A with a field of excellant drivers. If the 2 are running in the same class I think F1 will be more exciting .. sofar both are proven on asphalt/ carpet .. Its nice to see new ideas coming to RC . makes things more interesting ..