In one way, I like the new setup even system better than the old one on the small and Alpha SMDV speedboxes. On those units, one thing you have to watch out for is dust or sand getting inside the speedring. The new setup system of the Mega series is all external, so there's no risk of sand or other dirt getting inside and blocking the setup system. I've once had to open the speedring of my Speedbox 70 and the inside is almost as complex as a Swiss watch :-). It's a great system - I just wouldn't do any beach shots with it...
Another difference between the Mega series and the regular SMDV softboxes lies in how you break them down. The latter are broken down by depressing a couple of switch-like buttons, which is as fast as it gets. With the Mega series, however, you have to flip each of the 24 switches individually. Again, it's something that can be done in 30 seconds or so. So it's still very fast for a softbox this size (and with this many sides), just not as fast as its smaller siblings.
On my regular SMDV softboxes, I generally leave the middle diffuser and the front diffuser (and sometimes even the grid) attached when I break them up. While you could do so on the Mega series, especially on the 180 I think it's probably just as fast to take at least the front diffuser off when taking it down because leaving it on adds some extra tension when you tighten the rods to put it back together. This is one huge softbox, after all!
In the video below, I show you how easy it is to set up the softbox. In fact, putting on the front diffuser takes longer than setting up the actual softbox.