The Airstash isn't just for streaming media, it also is aimed at sharing files, collaborating on documents, and importing and exporting photos. To see how well it held up under pressure, I started some media streaming tests on the personal Apple devices and subsequently attempted to create folders and edit files with CyberDuck on the MacBook Air, which it handled fine.
Within CyberDuck (the free recommended Mac and Windows app) I saw consistent transfer speeds of around 740 KB/sec, and would occasionally see around 1.2 MB/sec.
Figure 3: AirStash transfer speed
The additional apps listed on the AirStash apps page were all paid apps, most $9.99, so I did not try them. However, I did find the AirStash+ app and WebDav Navigator adequate for tasks such manipulating files and directories and streaming media.
Figure 4: AirStash compatible apps
The image gallery below has a few more interesting screenshots.
At around $145 for the 8 GB model from most retailers, the AirStash is not cheap. But it works very well and is, I think, appropriately priced for what you receive. It's like a miniature NAS with media server that runs on batteries and needs very little configuration or maintenance. As storage needs change, it is upgradeable to 2 TB via SDXC cards. So it's relatively future-proof as long as that non-replaceable battery remains functional.
In an Apple-centric household the AirStash is a viable way to increase storage capacity, share files, and stream media, as long as you're not disappointed about the lack of support for AppleTV. In a non-Apple household, the support is there, but not nearly as polished as it is for Apple devices. Performance of the AirStash is very solid and was rather surprising given its miniature nature.