Respectfully Dave, I'm gonna disagree as I do see some opportunity for spotting. Problem might be that you are limited as to changing angles. Therefore it might be frowned upon by the homeless wizard.
Abraham you are absolutely correct. As the old saying goes if a weight can be lifted it can always be assisted.
However with this apparatus being a standing bench press movement where the plate loaded weight is behind and at the users feet, it would seem to be difficult to offer any aid in the lift.
While the user is vertical, braced against a bench, pushing the arms away there doesnt appear to be a traditional way to spot the bencher, by pulling the weight up or off, as the spotter isnt in a position of strength.
As the bench is directly behind the lifter with the along with the weight helping the lift at the elbow area is out of the question for one person.
In theory, a pair of spotters could work in tandem at either elbow (by placing their hands above or below the lifters arms) and drive the bars forward, but this could create a strength imbalance for the user if the assistance is unequal and it likely will be as no two spotters are alike.
If you're available I'd like for you, SF1900 and myself to run these tests together and post our findings on getbig.
UPDATE Upon further review a spotter can easily decrease resistance by lifting the weight stack in a deadlift style motion. We can cancel our previously scheduled testing.