I've just upgraded from the Thrustmaster T-Flight X to an X-55, and I love it. I got the TFX at first because I didn't know how much I would be using a HOTAS setup, but as it's turned out to be quite a lot, I decided to get the X-55 as it was on offer at the time (£150). The stick on mine is very smooth and I've not even bothered changing from the default green spring as it feels about right for me anyway. My throttles however are pretty tight, even on the least resistance setting, and nowhere near as buttery smooth as the one I had on the TFX, although I'm hoping they loosen up with use. If not, I'll open it up and see if there's anything that can be done to remedy it. Aside from that, it feels like a pretty decent bit of kit, although I do also miss the detente on the throttle of the TFX, however, it is much more accurate in terms of speed at the lower end. For example, on the X-55 I can move forward from 0 to 1, 2, 3 etc. onwards, whereas the TFX was a bit more 'lumpy' (3, 5, 7 etc.). It is nice also to not have to use the keyboard at all while using the X-55 (except possibly for the odd bit of typing). 
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