A few local guys and myself have been using the HF aluminum jack for quite awhile now. I'm personally very happy with it. It does make some creaking noise but that's just the way it is. I use it quite regularly, as in at least once a week. I haven't bent anything so far.
You said their customer service said you can't hurt the jack, but it is only rated up to 3000 lbs. Isn't the front of the Escalade already more than 3000 lbs?!
BTW, that jack you have looks like the same ones they sell at Kragen.