I have the Warthog, the X55 and the X65f, and they are all great in their own way.
I do like the X55, but my first one developed button problems and the replacement had an issue with one of the hats straight out of the box. My third one has a joystick that creaks when squeezed - the two halves don't stay together. However, I'm not that bothered by it as everything else is fine, once I removed the old joystick grease and replaced it to avoid friction. I'd love a higher build quality version of the X55. Perhaps we'll see the later some point in the future ala X52 and X52 pro.
If there was a twist Warthog, or a mod to buy, I'd jump on it. I was hoping that these guys would do it, but alas no...
http://www.realsimulator.com/html/fssb_r3_warthog.html
I was also hoping this stick would have a twist function, but out of luck again!
http://flightsimcontrols.com/store/joysticks/vkb-fat-black-mamba-joystick-for-eu-customers/
The trouble is, most flight sim enthusiasts don't want twist as it interferes with precision, and they are happy with pedals. I personally play ED with a laptop on my lap, and using pedals moves the computer around so is a non-starter
EDIT: Found this on the VKB site - Another twist stick
http://flightsimcontrols.com/store/upgrades/twist-rudder-function-upgrade-cobra-m5/