I also have a Seyco 21" that replaced a 21" Excalibur, that I sold and then wished I hadn't. I think for the most part they are very comparable. I think the Steve Good assembly video ought to be sent with the saw. It is not as easy as just taking the saw out of the box and mounting it on the stand. Very doable but, a little more complicated. The "big" table is really nice. I did not care for the magnetic table top "mat" and I replaced it with my own, mainly because I like to have zero clearance on my table top and I like to be able to do it with inserts that can be replaced.
My thoughts are if the new King saw is in fact as good as the Ex, at the price they are selling it for, Seyco will have to do something. It would be a no brain-er on which to buy, equal saws at non- equal prices.
One thing about the saws being manufactured by or at the same company, it doesn't necessarily mean they are of the same quality (this is my opinion, and I have no facts to back it up), the customer writes the spec for the equipment and does the enforcement of those specs. So to me the Vendor is very important to my decision. I already knew from experience what type a vendor Seyco is and was for the Ex. I am very leery about King, I do not know them. How long is the guarantee to return and replace if there is a problem? Harbor Freight is also good about that, for "'x" number of days (30 I think) unless you buy a extended warranty from them. I remember my mother-in-law purchased a little sander from them and returned and replaced 3 times before she finished her project, then what was left of the third sander, she tried to give it to me! I certainly would not want to go through that with a scroll saw.
I also did not look at a Jet when buying a new saw, because, I have one Jet machine that I am less than happy with. Also, I do not want to deal with service centers. They are very hit an miss on their customer service, and ability to repair something as obscure as scroll saws. Just read the stories on this forum about experiences with DeWalt service centers. From what I read is appears you have 50/50 chance of getting good service and a fix. Again just my opinion.
Oh man, too much coffee, sorry, I got carried away.... what was the question again?
Oh, ya "Any comments welcome", so there you go.
One more thing, just curious, I have heard many times this:
"Another concern of mine is I know high end company's many times produce a cheaper line for the big box stores.just an observation. "
Have you really experience that or how do you know this? I am not disputing this, I have heard it too, but I have not experienced it.