I like the script but...
I like it as it replaced my broken ps which was fine with sql2008R2 but failed on sql2012. Also it runs flawlessly when my servers sitting across different AD domains, which was also a challenge.
Now the but part, the data it collected are not that useful. It only let you compare used vs. allocated, rather than say to the actual drive free space. So if a db is near its next auto growth limit, it will shows as around 100%.
Nevertheless, it is a good starting point if only we want to modify its DMO SELECT in dynamic SQL.