So the WX1/2 system has had me eyebrow raising, although I haven't tried it myself (yet?). Although the temperature is variable, it's only variable depending on the attached pencil, of which there are, wait for it - /FIVE/. 40, 65, 80, 120, and 200 watts, each with different tip lineups. WTF.
One possible reason for this, of course, is that they don't use integrated heaters in the tips like most other high end soldering stations. With the heater in the iron itself, and the high power potential of the station, this would provide for too much temperature variance at the tip itself based on thermal masses of the tip and piece that you're soldering. So I'm guessing that they went with this option because they didn't have much of a choice unless they redesign their entire system.
The downsides that this presents are basically that the costs involved of getting the station plus the power potential irons that one would like can get fairly ridiculous. Temperature stability is not very good due to sensor being down in the heater instead of at the tip. On the plus side, the heat up times and thermal recovery are going to be pretty damn good (under 3 sec from what I've seen) due to the massive (potential) power output of the station, and the station itself probably has the most amount of easily accessible features (with a proper GUI to boot) that I've ever seen in its price range. Automatic sleep mode with accelerometer in particular is very nifty. In addition, because the tips are 'dumb', their prices will generally be slightly cheaper than that of those with integrated heaters.
So on the whole, I'd say it's worth a try especially if it's used under $200 or so, comes with the 80 or 120 watt iron (most tip options on these), and the stand. At that price it could be flipped on ebay easily at a slighly higher price if it doesn't meet your needs.
