Great Heavy Duty Rack
Your review: We purchased a total of 4 starter kits, 8 add-on kits, and 12 extra levels. We had all of them assembled in about 2 hours with 5 people. Very easy to assemble and change shelf height.
The only issue I have is the newer model has slots for 6 deck supports per shelf, but they are only including 5. The additional levels came with 6 each, but not the starter kits or add-on kits.