The best thing about grid scale was that it works with our existing systems which allowed us to use familiar tools and integrate their functionality within ours rather than have two separate applications running in parallel. It's not open source but this isn't necessarily an issue as far as I'm concerned unless you need specific features unavailable at no cost from any other vendor or provider of software. We were able to leverage what we already had without having to purchase new equipment/hardware - just by using a cloud solution for data management/storage.