I like the "ladder" to get to the top shelves. Had one from work they tossed out after being hit by a forklift. It wobbled a bit too much on the uneven floor for my liking.
I got luck. A buddy is a machinist at a local manufacturing plant and OSHA changed the standards for how steep the ladder was (new ones are 4 feet deeper) so 3 of his friends got these for their shops for free!