I'm not familiar with either of those brands, so I couldn't comment on the quality of the machine. However, if the saw works the way you want it and doesn't cause any problems, I'd invest in some other tools instead. I'm using a Craftsman 16" scroll saw that I picked up for $120. I think most would consider this an entry-level saw. But my saw performs very well and I can cut whatever I need. While I'd like to upgrade to a nicer saw, that to me would be more of a luxury. I'd rather buy additional tools so I can expand what projects I can do. Things like a table saw, drill press, sanders, planers, air compressors, brad nailers, chisels, etc.
However, if your saw isn't accomplishing what you want, you should probably upgrade. Problems like too much vibration, blade alignment, throat capacity or some other limitation.
With that said, when people upgrade to a higher quality saw, they're rarely disappointed.