After a freaking year of waiting I am the proud owner of a new CH Pro Throttle USB. I dug my other USB stuff out of the closet and have it all hooked up now. It was worth the wait for me.
The software that you have to download (software CD's aren't in yet and will cause delays if you decide to wait on it) does a real nice job of replacing Speed Keys. You can map any axis on any of the controllers to whatever joystick you want. You can set them for digital input for games that won't use the 9 axis you get with the throttle, pedals, and stick.
In Aces High I mapped the thumb joystick to use as my pan views. I can move my virtual head throughout the view range only using the joystick. Talk about immersion. When you look back left and want to look back right, your virtual head has to move to the front before you can look right. It moves fast so it's not a big deal. You can peek down just a hair to look at your flap indicator or fuel state on those planes that have those guages out of the normal front view and you can look up just over the canopy rail with just a small press of your thumb. Releasing the view stick returns your head to the front view.
There are 3 4-way hats and 1 8-way hat on the throttle. The 8-way is located right behind the view stick. I've mapped head movements to one of the hats on the joystick.
The toe brakes with the CH Pro Pedals USB are something else I really enjoy. Touching down and feathering the brakes just hard enough to keep the tail down and being able to steer adds a lot, much more than I would of thought.
Between the CH software and the flexibility of AH, you can do some amazing things. I still haven't experimented with the shifted function to give me even more stuff to play with and I'm sure there is much more here than I've been able to discover in a weekend.