This kit is the FG (First Grade) RX-78 Gundam released in 1999 to commemorate Gundam's 20th anniversary. It follows the same basic layout as the original 1/144 kit, but with redesigned proportions closer to the PG.
The molded colors are limited to a single color just like the old kit, and the articulation setup is pretty much the same too — except that the forearms can now rotate. On the plus side, it's snap-fit with no glue required, and the finished proportions and overall sculpt feel much more refined than the old version.
The articulation isn't dramatically better than the old kit, but the joints move surprisingly smoothly even without polycaps. And since the sculpt looks so good, the poses just come out looking a lot better than the old kit.
So the real appeal here is being able to build something with a classic format but a modern sculpt. At ¥300 it's also very affordable, making it a great kit for a quick, casual build or for painting practice. :-)
AIThis page was translated by Claude Sonnet.