I think it has some value
I think a bench like this does indeed have some value and usefulness. As your main bench, no way, but there are many times when one just needs a stable, non flexing structure to do some WW and the full size bench is way overkill.
Harry Strasil awhile back, did a post on his 'portable' bench, one he took around with him on his tours/shows, etc. It is more than stable and solid enough to do some serious work on but not so large as requiring a forklift to move it around.
Furthermore, I determined it would be a good early into the WW world project. It can be quite useful, can fit into a smallish area (always one of those in a shop) can allow me to do work that will lead up to a 'real' bench and develop some skills that will help ensure I do a half way decent job on the 'real' bench (BIG DTs are not easy to get them fitting real close all around, especially when the matching set is on a 75 pound top !! and the mate is 25 #s of leg/side)
So, I'm almost there. 50" long, 13" wide (19" feet), 4" thick maple top, 2-1/2” plank along one side so I can clamp long planks as needed on their side for edge planning, etc.
So, useful as an addition or step to getting to a 'real' bench (after a couple of tool cabinets to hold most used hand tools, then I make a real bench) where I can do much better work than on my 'B&D Workmate'.
However, I can't see $750, maybe $200 ?? or like an above poster, the vices are worth $150.
Thanks, Doug