Mine has so far. Built it in a class in July at the Woodwright's school and have finished two projects on it so far. The second was an oak table/desk that I had to surface the top boards prior to glue up and then again the finished panel. Worked like a charm and the bench did not budge the entire time. [IMG_3374](//muut.com/u/lostartpress/s3/:lostartpress:el0h:img_3374.jpg.jpg)
Mine seems to be fine. I've managed to get it to move if I try to plane across the grain (in 24" direction) and take too big of a bite, but really, it is fine.
Yea, the rear of mine is braced against stuff behind it so that is likely why mine doesn't budge even with a big bite. I have my dust collector and my scroll saw on the other side of the bench so I laid two 2 foot long 2x4s on the floor braced against the wall and under the stands of both tools. Just a safety measure to ensure I don't push the bench into them by mistake.
I have had no issues with scrubbing on mine 5-footer that weighs in at about 130 lbs. The only time it moves is when I get greedy and try to take too much off. Structurally, it has been solid.