Those are pretty nice!! I was able to get a couple of untreated rail ties that had been sectioned into 12'-16' chunks, and I usually use these, stacked with double-stacks at each point, under my truck's frames, when I need height and will be working under the vehicle. I started with jack stands, when putting a 4" Skyjacker system on my '93 W150, and the truck was too "wobbly" for my nerves. The chunks, stacked to appropriate height and in tandem at each frame point, were stable, and they are cheap. I think I like your setup better, though.
I've only had HF floor jacks; a 4T iron one and a smaller, Al one, and both have been excellent. The 4T IS a heavy beast, though. I gave it to a young friend who needed one for his family's first home with garage, for his own DYI work.