Never really heard of them. The machines seem really fiddly. The speeds are adjusted by belt drives. I'd rather have a dial to control my speeds. The exposed belt drive seems like a safety concern as well. Plus, I'm guessing you'd have to replace the belts on occasion too.
The blade changing is kinda strange too. Not sure how well I like the idea of removing the bottom blade holder attachment to simply replace the blade. Knowing my luck, I'd lose that blade holder in a pile of sawdust and I'd be out of luck. Plus, I'd want my blade changing to be tool-less.
Judging from the video, the machine sounds really loud. For that price, I think I'd stick with the Excalibur.
I posted the video below. Here's the website for those interested: http://www.pswood.com/scroll-saws/
http://www.youtube.com/watch?feature=player_embedded&v=YUA9Y6C6RIY