I had one of those rollaways (bottom cabinet) with the cave, like the one on the right. Hated it. You had to crouch down and fossick about in the dark space, looking for the thing you needed, which was invariably at the back. If it's big enough that it needs to go in a space like that, it's big enough to make shelves for.
It might make sense in a setting in which you have to lock up your tools when you go home so they don't get stolen/misused by the idiots on the other shift, but not in the home shop.
The rollaway I inherited from Dad, which was in the gas station he operated for a couple of years in my teens (before Texaco dropped the lease on the building and, at the same time, his franchise, all with 30 days' warning), originally had a cave, but the manufacturer had offered drawer inserts, and some prior owner had installed them. Not as good as drawers built in from the start - they're not quite as deep as the regular drawers - but better than a cave.
Can't speak to value; I had a Kennedy rollaway I paid $30 for, with some tools in it, at the end of someone's yard sale, with a cave, later replaced by a Kennedy with drawers all the way that I paid $75 for at an estate clearance house. I've even purchased a couple of boxes new, when I was unable to find the configuration I needed in the wild.
