This expansion adds a ton a variability to the map, plus the option to play on a smaller map for lower player counts. Another big plus is the 8 extra Structure Bonus tiles. The base game came with only 6 of these which meant the same tile can come up fairly regularly with repeated plays. Putting another 8 tiles into the mix adds to the variety and helps keep things fresh.
Overall, a great expansion if you've played a lot of Scythe and want to mix things up.