I too, own this scrollsaw. There was a period when they had some quality control problems. The uneven table was one problem. Another was misplacement of the blade slot in the table.
There was considerable discussion of these issues in various scroll saw forums. I suggest you Google that subject.
The Dewalt is considered one of the best saws available for the price. It has a full ball bearing parallelegram cutting system.
Also try this site:
http://www.scrollsaws.com/