I'd be curious to hear what you find with the TWCS. Without going to the top shelf throttle controls, it looked to me like a pretty good choice for the money.
Just received my VKB t-Rudder pedals and NXT lefty Gladiator yesterday. Seriously impressed with the quality of both. Finest hardware I've own, but as a lefty I never owned the Warthog stuff so I can't compare to that.
I've had the TWCS for a number of years and it's ok. The problem I have is that it is a slider sitting on rails. You don't get the same leverage as you would a lever arm of some type. And you are usually resting the weight of you hand on the device which increases the stickion. There is a small amount of sticky grabbiness you get from that.
I never noticed it much flying WWII warbirds as the throttle adjustments tended to be a little more coarse, but now that I am obsessive with helo's where you need really fine control of the collective, I'm finding that an annoyance. I'm looking for a better alternative for the TWCS. If I were a righty and had the room, I'd seriously consider a Virpil collective, but for now I'm looking for something tabletop.
I'd love it if VKB had a true throttle. I'm so impressed with their quality and service I'd buy one in a second. The thing they have though is a weird space sim thing that has spring return to center which won't work for my needs.