The MASS Device, and even the Weather Dominator that came in the one set, are really cool pieces and either, or both, would make great centerpieces for dioramas.
As I said, I completed my MD and I'm very happy to have it. I think I even managed to pick up the figures with the full MD element containers, which was a great upsell by Hasbro. It's just too bad that final DVD set was so hard to find. But that's kind of par for the course on the GI Joe line. After Joe had to go their DTC line and after first coming back for the 25th, retail didn't always give the line the best support.
Then there huge support for RoC, but we all know how that worked out. It definitely didn't instill any confidence in retail and that's been obvious with the way that POC/30th/Renegades have been handled.