I have a nice 14" band saw and a Hegner scroll saw (only because it showed up on craigslist for $200.00 and I was willing to drive the hour and fifteen minutes to get it). As the boy from Tumwater said, there is a place for both.
My Carter Stabilzer came the other day and it is remarkable. I put a 3/16" blade in it, tossed on my glasses and ear muffs and cranked out some 3/8" cuts that would have trashed my blade. Because of the preload (I didn't even reset the ride on the tire), I backed out of several scroll cuts that would have pulled me out of the guides instantly with my stock bearing guide system. Wow.
All the foregoing aside, the Stabilizer can't begin to compete with the Hegner for fine work in thin stock. For that, we are talking apples and aardvarks.
Oh, and when I grow up and can afford it, it's going to be the Excalibur for me.
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SIDE NOTES:
* I kept the guard nearly all the way up when pushing tight turns with the Stabilizer. Normally, I'd keep the guard just a fraction of an inch off the work, for safety reasons. They didn't talk about that in the Stailizer video, but that's the way the guy ran it, so I tried that and it seemed to allow me more abuse [of the blade].
* Again, I didn't reset the tracking on the wheel, though they recommend resetting it, but things seem to work fine with the old setting.