Well tbh, i will rev my sup to little over 7000 rpm when i want to take out maximum performance. The thing is, when you change in higher power band, revs doesn't drop that much after the gear change and you can get best possible acceleration.
If you have a good quality spark plugs and high octane gas, i believe there is a difference in torque&power in down low and mid range. For example, if you drive 2nd gear with low revs and you press the pedal, it just pick up speed much faster than standard car. It makes these cars much easier to drive fast. If you want to have more top end hp, i think it will need more supporting mods ie better flowing exhaust+headers, better intake and so on. On the other hand, my car feels that it does response modding better now than when it was equipped with stock ecu.
Great upgrade i think.