Can't speak for the warthog - but I recently got the CH Products flight stick and couldn't be happier!
Thinking about getting the throttle soon.
I also started with the X-Flight (brilliant for the money), then upgraded to the CH setup as I preferred functionality and comfort over looks (opinions may differ here

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I use the pedals a lot, but I also have yaw mapped to one of the hats when I'm playing standing up. Now I'm used to this I far prefer it over the twist grip.
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Money well spent is a function of how much you have (IMO). There is no way it is 10 times as good, but you get diminishing returns with pretty much everything as you move up the scale. For me, the upgrade was well worth it.
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The Warthog is clearly a solid piece of kit and many swear by it. Personally I did not like the resistances (the CH stick is very light in comparison) and I didn't like all the buttons on the base (The CH stick just has two trim wheels).
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I love the mini joystick on the CH throttle and I find the CH products fit my hand better (big hands). I get less wrist finger strain on the CH over the T-Flight and Warthog because of the low resistances and the fact that all the controls appear to be where my fingers sit naturally.
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Both choices are great over the T-Flight and both have far more controls than you really need (The T-Flight was lacking options here), but at the price differences, what do you expect?