shawn
Veteran
I ask because I do a lot of my shooting from my bicycle or while driving- not always taking too much time to frame up shots. The on-top scope or viewfinder could be ideal for this. The Yashicas are absurdly over-priced and the Sure Shot Ace doesn't quite have the optics I desire.
Eh, guess I'll just have a to make my own camera...
I had a Yashica T3 with the Superscope and it was fairly slow to shoot with as it was tiny to look at and of course everything was backwards relative to your view.
If you are looking to frame and shoot fast get a P&S with a hot/cold shoe or add one. Then put a 1:1 viewfinder on it such as the Leica Sbooi or Voigtlander Kontur and you can would keep both eyes open (required with the Kontur) and frame very quickly.
Shawn