I also got it cause I love owning all the packsI haven't dabbled with the new pack yet but here are some prime features;
The lot size challenge. Maybe you are a builder or not but there is something neat about the game counting tiles and rewarding you for making smaller footprint houses. The lot traits I hear are pretty OP
The new BB and CAS looks pretty top notch actually. Nice everyday-style.
A perfect companion pack to university. Imagine moving out after university and having a very tight budget but instead of moving into a smaller house you can build a small,tiny or micro home and actually benefit for having a smaller budget.
It helps make you think what do your Sims actually need and can help inspire more creative building.
Just a few ideas I had.