Hmm, Guess I'm going to have to pick up a couple of the extendaleg models as well. I received one of the standard tables for Xmas, and when I noticed them on sale at walmart after the holidays I couldn't resist five more at $42 each.
There does appear to be a difference with the clamps between the extend leg model and the standard leg model. The Extenda comes with 4 holding clamps and 2 toggle clamps, while the standard came with 2 12" bar clamps that fit in the groove of the table. Not sure which I prefer, found the bar clamps quite useful so far. Two of the tables with clamps didn't face any problems holding a 6x6" beam while I was running a scrub plane over it.