I've seen one of these in use, may not have been that specific brand but it looked the exact same. In my opinion the problem was that there was only one grade of hash. You don't get the full melt and then various other sized grades you would get from bubble bags.
The dudes using it were more commercial though so they loved the thing, said they got twice as much as out of the bags. Part of the extra yield could have been more contamination than out of bubble bag hash, it had a green tint to it.