The marvel modulars have been nothing short of fantastic (wink wink nudge nudge cough cough Baxter building). but this set just doesn't fully meet the standard of these sets. The daily bugle was one of the best Lego sets of its time and was just mind-blowing. it only made sence to follow it up with another set a year later - the sanctum, which was also absolutely amazing. then following it up with arguably the best Lego building of all time, the avengers tower, really cemented this series of modulars as a fan favorite. the X-mansion, however, barely reaches the standards of these sets. its attrociously over-priced, the Minifigures are rather lack luster, and the set is rather... small. It feels like the set went through some last minute changes. especially when it comes to height. it feels like a third floor was definitely meant to be there. one of the elevators has the word "lab floor one" written on it. which would indicate there would be a "lab floor two". in the instructions, it mentions there being a kitchen in the set, which definitely isn't there. the design of the building in the shows and movies also indicates a third floor, and some of the key rooms from the building are missing. definitely feels like there was originally a third floor before budget cuts were made or something. Though things aren't all bad, the set has some great action peices, and the techniques throughout the build are very well done. its also rather fun to build. And it doesn't look next to the other marvel modulars. (in which I own all of them).
so overall, huge flaws, but still manages to be a pretty decent set to get for your collection. I would definitely recommend it if you are into the marvel modulars, or into X-men in general.
also, having a wide modular like this one with a sky scraper would be awesome. fisk towers comes to mind especially.