Having had & used mine for over a year, I'd say:
The 3 drawer units are better value than the 6 drawer units. They are far more flexible & are cheaper. Don't glue the interior spacers in place, move the as necessary.
The corner draw units are fairly pricey. Buy the corner shelf units instead, they are cheaper. Leave out the little shelf inside & you've quite a big storage area.
The paper towel holder is not great. Only a small paper towel fits & it doesn't seem a good use of space.
The "WIP" units are a good storage area for largish bits. They are kept clean & you can see exactly what's in there.
The free-standing brush & tool holder is great. Holds a ton of stuff & can follow you around the bench.
The shelf-racks are flexible, but lack depth for larger items.