Unlike most spin-offs, Nube Neo retains the atmosphere and feel of the original very well. This is impressive, given that the original Nube ended 15 years ago.
Like in the original, 'Nube' utilizes a monster-of-the-week format. You would think this type of storytelling would quickly grow trite, but its consistently entertaining enough to avoid doing so, as was the original. Since this is a biweekly series (originally monthly), as opposed to weekly, the chapters are a bit longer, allowing for single-episode plots to be a little more developed. One of my gripes with the original was its tendency for quick and easy resolutions right at the end of the chapter, despite 17 pages of intense buildup that could've easily been elongated or further developed.
Nube Sensei's design remains consistent with the original, art and all. The original group of students are all grown up, and Kyoko is now a teacher herself. In between conflicts involving Nube's new batch of students, the series also sets aside some time to catch us up with his other former students. Hiroshi is playing soccer professionally overseas, and Katsuya has joined the military. This adds a nice touch to the manga, and changes up the regular monster-in-class format.
The weakest part of Nube Neo may be the new students themselves. Presently they feel like little more than stock characters, with generic designs and stereotypical shonen school behaviors. I suppose Hiroshi and the gang from the original may have seemed rather uninspired at first too, so this could easily change over time as a new regular cast is established.
Overall a great spin-off thats worthy of the original!