I returned and bought the Adler after playing with it at the shop for about an hour. It does, in fact, sew back over the exact same holes. Is that rare? (I have a Singer 500 home machine that can do that too.)
Got a welting foot and some 1lb spools of V69 thread included, along with the table and clutch motor too for $500.
My wife is giving me the "oh really" look, but I'm more excited than I thought I'd be about a sewing machine. (I've looked at $900 Sailrite LZ1 machines for several years, and this seems like it is SOOOOO much more capable.) Was supposedly used in the "rework room" at a furniture factory, so the guy claims it has less hard run time on it than a "line" machine but who knows?
I'd like a zipper foot, but it seems it uses two posts unlike normal industrial units, and the few locations I can find online want around $50 for them! (Hope this isn't the start of a trend with this unit.)
I'll post some sewing machine porn when I get it inside and set-up. The head alone is about 125 lbs. and I'm not up to wrangling that, and the similar- weight table, twice in one day.
You know your youth is really over when towing capacity and stitches per minute ratings thrill you more than 0-60 times or decibel ratings. <SIGH>