gene, I've only had the Delta 40-690 for about 9 months so it hasn't had much wear and tear. I did take it into the repair centre for knocking at higher speeds. They fixed that but couldn't get the blade to stay perpendicular to the table through it's stroke. I was able to partly fix that problem.
http://stevedgood.com/community/index.php?topic=6646.0The blade still moves forward and backward as it strokes up and down, between 1/16" and 1/32". That doesn't seem like much but I can feel the workpiece try to move back and forth when I'm cutting slowly. It doesn't seem to affect the cut, I just have to hold it a bit tighter.
The repair shop tightened one of the pivot bolts for the upper arm with the result that the arm stays up by itself. There is a click as it locks into place but it can be lowered relatively easily. One day I'll work on a spring assisted lift like the Easy Lift by jimdandy.
The markings on the saw indicate it is a Type 1 but I doubt it was made at the same factory as the Dewalt 788 Type 1 Saw.
Overall, I'm very satisfied with the saw and don't regret purchasing it.
Sorry I didn't reply sooner but hope this helps.
Jim