The Turbostick is OK, definitely better than the Acemore Freedom 16, but I only ever use it for vertical shooters. The turboswitch ROF can be turned up faster than the Turbopads can go and slow motion is nice. It's a little too lightweight and plastic-y, but if you don't like it you can always remove the cable and make a 10' controller or Turbotap.
The one-handed Quickshot is a novelty; it's no 3DO Flight Stick Pro.
I still haven't tried the Superstick.
Here's some old chat: http://www.pcenginefx.com/forums/index.php?topic=2808.0