I purchased cloud storage with SC, but... honestly, hopefully the price was really cheap (regarding other cloud storage services) because it was really complex, non intuitive and... well, let's be honest, I finally never used that space storage because when I finally was able to upload files, it turned my computer crazy when I tried to upload... I always had to restart my computer after a short time (info : but I'm able to play recent video games). My main goal was to test the functioning of Siacoin.
I'm supporting Siacoin since June 2016, and I really think it's one of the best project in the crypto field, but from a critical standpoint, it's not working properly for the moment. People don't want to spend time to understand how Siacoin works, to solve issues that they would encounter, without being sure that it'll work at the end and that even if it's 5x cheaper than Amazon S3 services.
Imo, I would say that it's important to still be aware that a lot of work is still needed for Siacoin to make a breakthrough. I invite you to try their cloud storage service for making your own judgment. It was still a great pleasure to finally see a project that is working, even if it was a little bit tough, and to experience it ! I hope it'll be easier and massively adopted in the future